JP4314712B2 - Pier structure and its construction method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a pier structure and a construction method thereof.
[0002]
[Prior art]
In recent years, in the field of civil engineering and building structures, advancement has been promoted from the viewpoints of size increase, diversification, improvement of earthquake resistance, etc., due to technological development and customer needs. For example, in road construction, when a route is selected as a mountainous area, a high pier structure format is adopted in a valley or a river part.
[0003]
As the prior art of the structure type and construction method of the pier suitable for the seed construction conditions, the present applicant has previously developed the technology shown in Japanese Patent No. 2982551 and Japanese Patent No. 2973775. This prior art is a pier structure made by alternately repeating the operation of placing concrete into a hollow inside of a formwork block formed by combining a plurality of precast concrete formwork elements until a predetermined height is reached. In the construction of the structure, since the formwork block is used as the formwork that forms the outer shape of the structure, there is no need to install and remove the formwork as in the conventional construction method. Suitable for shortening.
[0004]
[Problems to be solved by the invention]
However, in order to secure strength, the pier structure made by this construction method must be arranged in a congested state with many main reinforcing bars, horizontal reinforcing bars, or assembled reinforcing bars in the hollow interior. The work of bar arrangement was troublesome, the number of tasks increased, and it took time to work. Also, in such a structure, especially when a high pier is constructed, the load increases, so the response displacement increases, and if a horizontal force such as seismic force is applied, the durability and earthquake resistance of the structure may be impaired. There is. Conversely, in order to further improve durability and seismic resistance against this type of displacement, it is necessary to have a rigid structure that exceeds this, creating a structural vicious circle between the weight and strength of the structural material. There was concern.
[0005]
The present invention solves the above problems, and provides a pier structure that can reduce the load of the pier structure and is light in weight while ensuring sufficient required strength, and a construction method thereof. Is.
[0006]
[Means for Solving the Problems]
To achieve the above object, pier structure of the present invention, Rutotomoni are densely arranged on top of the foundation, in contact at least one surface between but adjacent to each other and polygonal cross-sectional shape in the longitudinal direction are sequentially joined a plurality of column made of hollow precast concrete, Rutotomoni is Tatekoma inside of each column, a hollow steel pipe which are sequentially joined in the longitudinal direction, in the outer filling the gap between the hollow steel tube and the column Filled concrete, inner filled concrete filled only in a portion corresponding to the vicinity of the longitudinal joining position of each column inside each hollow steel pipe, and a portion filled with the inner filled concrete are horizontally penetrated. It is fixed to a tension state, and consists of a PC steel material for lateral fastening that binds the plurality of columns in a cross-sectional direction .
Accordingly, in the present invention, a structure in which a single hollow steel pipe is joined instead of a large number of reinforcing bars, and the lateral joining strength between the column and the hollow steel pipes can be sufficiently secured, so that the amount of concrete is small and the weight is reduced. Sufficient yield strength can be ensured.
Moreover, only the portion corresponding to the vicinity of the longitudinal joining position of each column inside the hollow steel pipe is filled with the inner filling concrete, and the PC steel material for lateral fastening penetrates in the transverse direction and is strained at this position. Since the state is fixed, a plurality of columns can be fastened in the cross-sectional direction. Accordingly, it is possible to sufficiently secure the lateral joint strength while reducing the weight, and to improve the shear strength and seismic resistance during the seismic action.
[0007]
In the invention according to claim 2, the longitudinal joining position of the column and the longitudinal joining position of the hollow steel pipe are shifted in the longitudinal direction, and the upper end of the hollow steel pipe is protruded above the upper end of the column. As a result, the fragility of the column and the steel pipe in the longitudinal direction can be avoided.
Further, in the invention according to claim 3, wherein the center of each hollow steel pipe, PC steel for longitudinal joint is fixed in tension, the PC steel for said longitudinal direction joining, the hollow steel pipes and each column By being fastened in the vertical direction, the strength in the vertical direction can be sufficiently secured.
[0008]
In the invention according to claim 4 , the column can be freely combined as a segment unit according to the planned strength according to the pier scale, height, etc. by making a hexagonal cross section, The design can be diversified according to various variations.
[0009]
Further, in the method of the present invention , a plurality of hollow steel pipes are built in a dense state on the upper part of the foundation , the hollow steel pipes are sequentially joined in the vertical direction, and a hollow precast having a polygonal cross section around each hollow steel pipe. like an anchor for concrete columns, with sequentially joining the column in the vertical direction, by contacting at least one surface of adjacent columns to each other, filling the outer being packed concrete in the gap between the hollow steel tube and the column, the Only the portion corresponding to the vicinity of the longitudinal joining position of each column inside each hollow steel pipe is filled with inner filling concrete, and the portion filled with the inner filling concrete is penetrated in the horizontal direction by PC steel for lateral fastening. The PC steel material for lateral fastening is fixed in a tension state, and the plurality of columns are fastened in the cross-sectional direction .
Therefore, in the method of the present invention, the amount of cast concrete is small, and it is an operation of sequentially joining the hollow steel pipes in the height direction instead of the conventional rebar, so the operation is good, labor saving and rapid workability. Obtainable.
Also, only the portion corresponding to the vicinity of the longitudinal joining position of each column inside the steel pipe is filled with the inside filling concrete, and the PC steel material for lateral fastening penetrates in the transverse direction in this position and is in a tensioned state. Thus, a plurality of columns can be fastened in the cross-sectional direction. Accordingly, it is possible to sufficiently secure the lateral joint strength while reducing the weight, and to improve the shear strength and seismic resistance during the seismic action.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. 1 to 5 show a construction procedure of a pier structure according to the present invention. First, FIG. 1 shows the construction status of the foundation part. A plurality of ribbed steel pipes 2 are arranged on the upper part of the H-shaped steel 1 installed in the ground, and concrete is placed on the outer periphery thereof. Thus, foundation 3 is constructed. And in the upper part of a footing top end part, the hollow steel pipe 4 is joined to the upper part of the ribbed steel pipe 2, and the column 5 which consists of PC members is arrange | positioned in the outer peripheral part of each steel pipe 4. Moreover, as shown in FIG.
[0011]
Each column 5 forms the appearance of a structure as a discarded mold, and is a precast concrete member having a regular hexagonal cross section, for example, as shown in FIG. 2, and an epoxy reinforcing bar or carbon fiber as a reinforcing bar. It is made of a lightweight, high-strength material that is embedded in a single piece. In the illustrated example, a honeycomb shape having a predetermined cross section with the center of the structure opened in a hexagonal shape is formed, and at least one surface of the adjacent columns 5 is in close contact with each other to be in contact with each other. This arrangement interval is an arrangement according to the planned cross section of the pier, and in addition to the example shown in the drawing, a plurality of columns 5 can be arranged as a segment according to the scale and the height of the pier.
[0012]
Then, in the state where the first steel pipe 4 and the column 5 are built, in the gap between the steel pipe 4 and the column 5 , the inside concrete 6 which is the outside inside concrete is placed by the concrete placement work, Is achieved. In addition, the pitch of the joining surface of the longitudinal direction of each column 5 and the steel pipe 4 is shifted, and it is set as the arrangement which the steel pipe 4 protrudes from the top end of the column 5 as shown in FIG. 3, FIG. Can avoid the vulnerability at the joint.
[0013]
As shown in FIG. 3, a self-raising temporary scaffolding 7 is arranged around the upper part of the column 5 described above, and ascends sequentially as the construction progresses in the height direction. In FIG. 3, reference numeral 8 is a temporary elevator structure disposed in the vicinity of the temporary scaffold 7, and reference numeral 9 is a tower crane for lifting material disposed on the crane scaffold 10. In response, it is added upward.
[0014]
The tower crane 9 alternates between the erection of the upper steel pipe 4 and the erection of the column 5 after finishing the welding operation on the lower steel pipe 4 after completion of the erection operation. After the above column 5 is built, the filled concrete 6 is cast and filled in the same manner as described above. By repeating this operation up to the design height, the high pier is completed, and the bridge 11 is arranged on the upper part. .
[0015]
Further, in some cases, as shown in a cross-sectional view in FIG. 5, the PC steel material 12 for longitudinal joining is arranged at the center, and the upper and lower sides of the PC steel material 12 are tensioned to minimize the residual displacement after the earthquake. It can also be converted.
[0016]
Further, in the general portion, as shown in FIG. 5A, the inside of the steel pipe 4 is held in a hollow state, while in the vicinity of the longitudinal joining position between the columns 5, FIG. As shown in FIG. 3, the inside of the steel pipe 4 is also filled with the filling concrete 6 which is the inside filling concrete . And in this position, the PC steel material 14 for horizontal fastening penetrates each horizontal direction, and is arrange | positioned in the tension | tensile_strength state. In the illustrated example of the set, the center portion of the structure is open and linearly arranged above and below it, so that the PC steel material 14 penetrates the surrounding column 5 and steel pipe 4 and is arranged in a circle. In the side-by-side positions of the columns 5 and the steel pipes 4, they are penetrated in a straight line, both ends thereof are fixed in a tension state, the entire structure is fastened along the cross section, and sufficient lateral joint strength is ensured. This reinforcement effect improves the shear strength and seismic resistance during earthquake action.
[0017]
6A and 6B show another example of the collective pattern of the columns 5. In FIG. 6A, the peripheral columns 5 are arranged on four sides of the column 5 which is the center of the structure, and adjacent to the surroundings. The columns 5 are arranged so as to be in close contact with each other . Further, (b), the state which opens the structure around the hexagonal shape, six column 5 so as to surround the opening densely arranged around the opening, contact one side ends of the column 5 adjacent in the circumferential direction It has been made.
[0018]
In addition to the above, according to the planned strength according to the pier scale, height, etc., the column can be combined into various cross sections as segment units, and the design can be diversified according to various variations. The cross-section of the column 5 is not limited to a hexagonal shape, but the hexagonal shape is most recommended in terms of compatibility with the cross-sectional direction, jointability in a densely arranged state, and the like.
[0019]
【The invention's effect】
As is clear from the above description, in the pier structure and construction method according to the present invention, the load on the pier structure can be reduced, and the required strength, durability and earthquake resistance are sufficiently secured while being lightweight. Further, it is suitable for shortening the construction period. The column has a hexagonal cross section, which can be freely combined as a segment unit according to the planned strength according to the pier scale, height, etc., and design diversification according to various variations. Can be planned.
Moreover, the vulnerability of the joining position of each column and the hollow steel pipe in the vertical direction can be avoided. Further, only the portion corresponding to the vicinity of the longitudinal joining position of each column inside each hollow steel pipe is filled with the inner filling concrete, and the PC steel material for transverse fastening penetrates in this direction in the transverse direction, and tension is applied. In this state, the plurality of columns can be fastened in the cross-sectional direction. Accordingly, it is possible to sufficiently secure the lateral joint strength while reducing the weight, and to improve the shear strength and seismic resistance during the seismic action.
[Brief description of the drawings]
FIG. 1 is a sectional view showing a foundation construction stage in a construction procedure according to the present invention.
FIG. 2 is a cross-sectional view taken along line AA in FIG.
FIG. 3 is a side view showing a joining procedure in the vertical direction.
FIGS. 4A and 4B are perspective views showing the joining procedure. FIG.
5A and 5B are plan sectional views taken along lines BB and cc in FIG.
FIGS. 6A and 6B are cross-sectional plan views showing a modification example of a combination example of segments. FIGS.
[Explanation of symbols]
4 Hollow steel pipe 5 Column 6 Filled concrete 12 Longitudinal PC steel 14 Horizontally tightened PC steel

Claims (5)

Rutotomoni are densely arranged on top of the foundation, in contact with each other at least one side but adjacent to each other, and a hollow plurality of columns made of precast concrete of polygonal cross-sectional shape in the longitudinal direction are sequentially joined,
Rutotomoni is Tatekoma inside of each column, a hollow steel pipe which are sequentially joined in the longitudinal direction,
Outer filled concrete filled in the gap between the hollow steel pipe and the column;
Inside filled concrete filled only in the portion corresponding to the vicinity of the longitudinal joining position of each column inside each hollow steel pipe ,
A bridge pier structure comprising: a PC steel material for lateral fastening which penetrates a portion filled with the inner filling concrete in a lateral direction and is fixed in a tension state and fastens the plurality of columns in a cross-sectional direction . The longitudinal joining position of the column and the longitudinal joining position of the hollow steel pipe are shifted in the longitudinal direction so that the upper end of the hollow steel pipe protrudes above the upper end of the column. The listed pier structure. In the center of each hollow steel pipe, a PC steel material for longitudinal joining is fixed in a tension state, and each hollow steel pipe and each column are fastened in the longitudinal direction by the PC steel material for longitudinal joining. The pier structure according to claim 1 or 2.   The pier structure according to any one of claims 1 to 3, wherein the column has a hexagonal cross section. Like an anchor in a state of dense multiple hollow steel tube on top of the foundation, as well as sequentially joining the respective hollow steel pipe in the longitudinal direction, like an anchor said hollow precast concrete column polygonal section around each hollow steel tube , And sequentially joining the columns in the vertical direction, with at least one surface of adjacent columns contacting each other ,
Filling the gap between the column and the hollow steel pipe with outer filling concrete,
Filling the inner filling concrete only in the portion corresponding to the vicinity of the longitudinal joining position of each column inside each hollow steel pipe ,
A portion filled with the inner filling concrete is laterally penetrated by a PC steel material for lateral fastening, the PC steel material for lateral fastening is fixed in a tension state, and the plurality of columns are fastened in a cross-sectional direction. The construction method of the pier structure.

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