JPH11324224A - Column structure and its construction - Google Patents

Abstract

PROBLEM TO BE SOLVED: To inexpensively give superior earthquake resistance to a column without becoming the obstruction of a construction plan in the case where the novel column is constructed by disposing a wire gauze so as to surround a main bar, placing concrete in the inside of the wire gauze and adhering concrete and the wire gauze. SOLUTION: A lath wire gauze 22 is provided so as to surround a main bar 21 to compose column structure 20. A hoop bar is provided on the main bar 21. In addition, the lath wire gauze 22 is held with a spiral bar 24. The spiral bar 24 is formed in the substantial same diameter as the column structure 20 and disposed so that the axial direction is the same as the extension direction of the main bar 21. Concrete is placed in a space surrounded by the lath wire gauze 22, and integrated to adhere to the lath wire gauze 22. Since the concrete is reinforced by the wire gauze from an outer periphery, the structure of high toughness can be realized as compared with the normal reinforced concrete column.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pillar structure constituting a structure and a method of constructing the same.

[0002]

2. Description of the Related Art As is well known, in order to construct a pillar structure in a structure such as a building, first, rebars constituting columns are assembled, and a formwork is arranged around these rebars.
A method of casting concrete in this formwork has been used.

FIGS. 19 and 20 show an example of such a construction method. In these figures, reference numeral 1 denotes a mold, 2 denotes a column main bar, and 3 denotes a hoop bar. In order to form a pillar structure using these, first, the pillar main reinforcement 2 and the hoop reinforcement 3 are assembled in a vertical pillar shape, and a plywood form material 5 constituting the mold 1 is formed around the pillar reinforcement in a predetermined column cross section. To be placed. Next, the plywood form member 5 is reinforced with a vertical end thick member 6 and a horizontal end thick member 7, and the form 1 is interposed between the horizontal end thick members 7, 7 arranged in parallel with each other with a columnar structure therebetween. Are arranged so as to penetrate the space S surrounded by the mold 1, and both ends of the separators 8, 8,. Fix by ...

[0004] After reinforcing the formwork 1 in this manner, concrete is poured into the space S, and after the concrete has hardened, the formwork 1 is removed, whereby a column structure can be constructed.

[0005] In recent years, the use of a form member made of precast concrete or iron plate as a discard form has led to the spread of a drive-in form method that does not require work related to form removal.

FIGS. 21 and 22 show an example of a method of constructing a pillar structure using such a driving form method. In the drawings, reference numeral 12 denotes a weir plate made of a precast concrete slab. Reference numeral 13 denotes a column clamp member which is disposed outside the weir plate 12 and holds the weir plate 12. In these figures, FIG.
Components common to those shown in FIGS. 9 and 20 are denoted by the same reference numerals, and description thereof will be omitted.

When forming a pillar structure by the construction method shown in FIGS. 21 and 22, first, the pillar main reinforcement 2 and the hoop reinforcement 3 are assembled in a vertical column shape, and the weirs 12, 12,. Are arranged so as to form a predetermined pillar cross section. Next, the weir plates 12, 12,... Are reinforced by column clamp members 13, 13,.
By casting concrete in the space surrounded by 2, 12, ..., a pillar structure can be formed. In this case, it is not necessary to remove the weir plates 12, 12,...

[0008]

By the way, as reported in various investigations after the Great Hanshin Earthquake, at the time of a large earthquake, the first floor of the building, the reinforced concrete column on the middle floor, and the railway and It has been pointed out that there is a concern that a reinforced concrete column part of an elevated column base such as a highway may be crushed by a strong seismic force. As a result, in parallel with the review of the seismic design, the number of seismic diagnoses by specialists in all parts of the country has been rapidly increasing, and as a result, shear reinforcement work has been actively carried out especially on reinforced concrete columns. As such shear reinforcement work, a method of improving the toughness of a column by winding an iron plate or carbon fiber around the column is most commonly employed.

[0009] This column reinforcement work is mainly intended for existing column structures. On the other hand, in the above-mentioned method of constructing a column structure used for newly constructing a structure, No consideration has been given to increasing toughness, and in order to obtain excellent seismic resistance in advance, the only solution is to increase the column section, increase the strength of the concrete material itself, or increase the amount of reinforcing steel. Was. However, if it is attempted to obtain seismic resistance by such a method, not only the material cost and the like will increase but also the construction plan may be restricted.

In view of such circumstances, according to the present invention, when a new pillar is constructed, the pillar is provided with excellent seismic resistance in advance at low cost and without hindering the construction plan. It is an object of the present invention to provide a technology capable of performing such operations.

[0011]

Means for Solving the Problems To solve the above problems, the present invention employs the following means. That is,
The pillar structure according to claim 1, comprising a main reinforcing bar and a wire mesh arranged so as to surround the main reinforcing bar, wherein concrete is poured into the wire mesh, and the concrete and the wire mesh are adhered to each other. It is characterized by being.

In this column structure, since the concrete is reinforced by the wire mesh from the outer periphery thereof, a structure having higher toughness as compared with ordinary reinforced concrete columns can be realized. In addition, the wire mesh can be used as a waste form.

According to a second aspect of the present invention, there is provided the pillar structure according to the first aspect, wherein the spiral streak surrounds the pillar structure, and the main streaks extend in the axial direction. And the wire mesh is reinforced by the spiral streaks.

In this column structure, the toughness can be further improved by reinforcing the wire netting with spiral streaks.

According to a third aspect of the present invention, there is provided a method for constructing a pillar structure, wherein a main reinforcing bar is erected at a position where the pillar structure is to be installed, and a wire netting is arranged to surround the main reinforcing bar. And concrete is poured into a space surrounded by the wire mesh.

In this method of constructing a pillar structure, the wire mesh can be used as a discarded formwork, and the work related to the mold removal from the formwork is not required as in the conventional driving formwork method.

According to a fourth aspect of the present invention, in the method of constructing a pillar structure according to the third aspect, when erecting the main reinforcement, the spiral reinforcement is compressed in an axial direction thereof. It is arranged so as to surround the installation target position of the pillar structure, the main muscle is erected at a position surrounded by the spiral muscle, and after the main muscle is erected, the spiral muscle is stretched in the axial direction. The wire mesh is fixed to the stretched spiral streaks.

In this method of constructing a pillar structure, it is possible to easily install a spiral streak that reinforces the wire mesh and improves the toughness of the pillar structure.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIGS. 1 and 2 are diagrams showing a schematic configuration of a pillar structure 20 according to an embodiment of the present invention.

As shown in the figure, the pillar structure 20
, And a lath wire mesh 22 provided so as to surround the main bars 21, 21,. Main bar 2
The hoops 23 are provided at 1, 21,.... The lath wire mesh 22 is held by a spiral streak 24. The spiral streaks 24 are formed so as to have substantially the same diameter as the column structure 20, and are arranged such that the axial direction thereof is the same as the extending direction of the main streaks 21, 21,.

In the space surrounded by the lath wire mesh 22, concrete (not shown) is cast, and the concrete is attached to the lath wire mesh 22 to be integrated therewith. That is, the lath wire mesh 22 is used as a driving formwork. For this reason, the lath wire mesh 22 having a mesh size such that the concrete does not leak is used.

FIGS. 3 and 4 are views showing the column structure 20 having the above-described schematic configuration in further detail.
As shown in these figures, pressing reinforcing bars 26, 26,... Are arranged around the lath wire mesh 22 at equal intervals in the circumferential direction and in a direction parallel to the main reinforcing bars 21, 21,. Separator metal fittings 27 are provided between the holding reinforcing bars 26, 26 arranged point-symmetrically with respect to the center of the column structure 20.
Is provided. As shown in FIGS. 5 and 6 in an enlarged manner,
The separator hardware 27 is fixed to the hoop 23 by the positioning hardware 28, and its end 2.
7a is the form tie hardware 29 against the holding steel 26.
Are combined using This makes it possible to appropriately maintain the position of the lath wire mesh 22 and to counteract the lateral pressure of concrete cast inside the lath wire mesh 22.

Next, a method of constructing the pillar structure 20 will be described. First, as shown in FIG. 7, a spiral muscle 24 that is compressed in the vertical direction (axial direction) is arranged at the installation target position of the pillar on the floor 30.
4 and a reinforcing bar assembly 31 composed of main bars 21, 21,... And hoop bars 23, 23,.
In this case, care must be taken so that the spiral streaks 24 do not hinder the rebar assembling work.

Next, as shown in FIG. 8, the spiral streaks 24 arranged on the floor 30 are stretched in the vertical direction and fixed to the reinforcing bar assembly 31 so that they are set as base steel frames.

Further, as shown in FIG. 9, the metal parts 27,... Subsequently, as shown in FIG. 10, a lath wire mesh 22 is stretched from outside the spiral streaks 24 without any gap, and the spiral wires 24 and the lath wire mesh 22 are fixed at various places by binding wires (not shown).

(See FIGS. 5 and 6) are arranged around the lath wire mesh 22. The holding reinforcing bars 26, 26,.
(See FIGS. 5 and 6) and from outside using the form tie hardware 29, 29,.
, And the spiral streaks 24, 24,... Maintain the correct cover size. Further, as shown in FIG. 11, the holding reinforcing bars 26, 26,.
Separately, the vertical thick pipes 32, 32,.
Are arranged at various places around the lath so that the lath wire mesh 22 can be held more firmly.

Then, as shown in FIG.
After the concrete is poured into the concrete 2 and the concrete is hardened, the columnar structure 20 can be completed by removing the vertical thick pipes 32, 32,.

In the above-described column structure 20, the lath wire mesh 2
The concrete is poured into the space surrounded by 2 and the concrete and the lath wire mesh 22 adhere to each other, so that the concrete is reinforced by the lath wire mesh 22 from the outer periphery thereof. A reinforced concrete column can realize a structure with higher toughness. Therefore, there is no need to increase the column cross section, increase the strength of the concrete material itself, or increase the amount of reinforcing bars in order to obtain earthquake resistance, which is advantageous in terms of cost and construction planning.

In this case, as described above, the pillar structure 20 is used.
The spiral wire 24 is provided so as to surround the lath wire mesh 2
2 can be strongly reinforced to further improve the toughness of the column structure 20 and realize a structure with more excellent earthquake resistance.

Also, in the above-described method of constructing the column structure 20, the lath wire mesh 22 is used as a discarded formwork, so that it is easy to assemble the formwork on site, unlike a normal reinforced concrete column, and to form the formwork. Since no demolding work is required, labor-saving of on-site labor can be greatly reduced. Further, unlike the conventional driving formwork method, since the concrete placing condition can be grasped through the lath wire mesh 22, the work can be facilitated and the workability is excellent.

As described above, the spiral muscle 24 is placed on the floor 30 in a state where it is compressed in advance, and after the main muscles 21, 21,... Are erected, the spiral muscle is stretched upward. In this case, the spiral streaks 24 can be easily attached, and the lath wire mesh 22 can be easily reinforced.

Although an example of the embodiment of the present invention has been described above, the present invention is not limited to the above-described embodiment, but may be modified or modified in accordance with structural and design requirements. Can be adopted.

For example, the column structure 20 of the above embodiment is
Although the example of the case where the cross section is circular is shown in FIG.
As shown in FIG. 3 and FIG.
5 may be formed.

13 and 14, a pillar structure 35 is shown.
The hoop streaks 37 and the spiral streaks 38 are formed to have a substantially square shape when viewed from above, corresponding to the cross-sectional shape of FIG. Therefore, the same reference numerals are used for these common components as in the above embodiment.

The details of the structure of the pillar structure 35 are shown in FIG.
18 to FIG. In this case, a larger lateral pressure acts on the lath wire mesh 22 and the spiral streaks 38 during concrete casting than in the above-described embodiment. It is necessary to arrange the thick pipe 32 as appropriate and firmly fix it to the separator hardware 27 using the foam tie hardware 29.

When a decorative finish is required for the pillar structure 20 or 35 described above, the outer peripheral surface thereof is finished with mortar, or a plaster board is attached with an adhesive. Can be dealt with.

[0037]

As described above, in the pillar structure according to the first aspect, concrete is poured into the space surrounded by the wire mesh so that the concrete and the wire mesh adhere to each other. Can be reinforced from its outer periphery to realize a structure with high toughness. Therefore, there is no need to increase the column cross section, increase the strength of the concrete material itself, or increase the amount of reinforcing bars in order to obtain earthquake resistance, which is advantageous in terms of cost and construction planning. Further, since the wire mesh can be used as a discarded formwork, the workability is excellent. Further, at this time, by providing a spiral streak so as to surround the column structure as in claim 2, the wire mesh can be strongly reinforced, the toughness of the column structure is further improved, and the seismic resistance is further improved. The structure can be realized.

In the method of constructing a pillar structure according to the third aspect, since the wire mesh is a discarded formwork, unlike a normal reinforced concrete column, it is easy to assemble the formwork on site and to form the formwork. Since no demolding work is required, labor-saving of on-site labor can be greatly reduced. Further, unlike the conventional driving formwork method, since the concrete placing condition can be grasped through a wire mesh, the work can be facilitated. In this case, the main muscle is erected inside the spiral muscle that has been compressed in advance, and
After that, if the spiral streaks are stretched upward, the spiral streaks for reinforcing the wire mesh can be easily attached, and the invention of claim 3 can be favorably realized.

[Brief description of the drawings]

FIG. 1 is a front view of a pillar structure schematically showing an embodiment of the present invention.

FIG. 2 is a plan sectional view of the same.

FIG. 3 is a front view showing details of a pillar structure shown in FIGS.

FIG. 4 is a plan sectional view of the same.

FIG. 5 is a plan sectional view showing how the metal fittings of the separator shown in FIG.

FIG. 6 is a vertical sectional view of the same.

FIG. 7 is a view showing a method of constructing a column structure according to the present invention, and is a front view showing a situation when a reinforcing bar assembly is erected.

FIG. 8 is a front view showing the situation when the spiral muscle is set.

FIG. 9 is a front view showing the situation when a metal separator is attached.

FIG. 10 is a front view showing the situation when the lath wire mesh is stretched around the spiral streaks.

FIG. 11 is a front view showing the situation when the vertical pipe and the foam tie hardware are attached.

FIG. 12 is a front view showing the situation during concrete placement.

FIG. 13 is a plan sectional view of a pillar structure schematically showing another embodiment of the present invention.

FIG. 14 is a front view of the same.

FIG. 15 is a front view showing details of the column structure shown in FIGS.

FIG. 16 is a plan sectional view of the same.

FIG. 17 is a cross-sectional plan view showing the connection between the separator hardware shown in FIG. 16 and the hoop streak and the vertical pipe.

FIG. 18 is an elevational sectional view of the same.

FIG. 19 is a view showing a conventional technique of the present invention, and is a front view showing a situation when a reinforced concrete column structure is formed using a plywood form material.

FIG. 20 is a plan sectional view of the same.

FIG. 21 is a view showing another example of the prior art of the present invention, and is a front view showing a situation when a reinforced concrete column structure is formed using a driving form method.

FIG. 22 is a plan sectional view of the same.

[Explanation of symbols]

 20, 35 pillar structure 21 main reinforcement 22 lath wire mesh 24, 38 spiral reinforcement

Claims (4)

[Claims] 1. A structure comprising a main reinforcement and a wire mesh arranged so as to surround the main reinforcement, wherein concrete is cast into the inside of the wire mesh, and the concrete and the wire mesh are adhered to each other. A pillar structure characterized by: 2. The pillar structure according to claim 1, wherein a spiral streak surrounds the pillar structure, and
A pillar structure, wherein the main reinforcement is arranged so that an extending direction of the main reinforcement is in the axial direction, and the wire mesh is reinforced by the spiral reinforcement. 3. A method for constructing a pillar structure, wherein a main bar is erected at an installation target position of the column structure, a wire mesh is provided so as to surround the main bar, and a space surrounded by the wire mesh is provided. A method of constructing a pillar structure, wherein concrete is poured into a column. 4. The method of constructing a pillar structure according to claim 3, wherein, when the main reinforcement is erected, the spiral reinforcement is compressed in the axial direction so as to surround the installation target position of the pillar structure. The main muscle is erected at a position surrounded by the spiral muscle, and after the main muscle is erected, the spiral muscle is stretched in the axial direction, and the wire mesh is stretched with respect to the elongated spiral muscle. A method for constructing a pillar structure, characterized by fixing a pillar.