JP4043565B2 - Concrete structure - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a concrete structure, and more particularly suitable concrete structure when mounting the reinforcing member is precast into the surrounding concrete column.
[0002]
[Prior art]
For example, when earthquake-proof reinforcement is applied to an existing concrete column, conventionally, two L-shaped or U-shaped steel plates are prepared, arranged so as to surround the concrete column, and joined together by welding the butted portions. It was common.
[0003]
For example, when joining a precast concrete segment ring, a bolt box is provided at the joint of the segment ring, and a single plate is installed on the bolt box of the adjacent segment ring. It was common to fix to each segment ring with a bolt and a nut. Thus, when joining a precast material, the method of joining the reinforcing bars incorporated in the precast material by welding etc. was also performed.
[0004]
[Problems to be solved by the invention]
However, when steel plates placed around existing concrete columns are joined by welding as in the conventional case, it is an on-site work, so it is difficult to perform reliable welding, and poor weldability is likely to occur, resulting in lack of reliability. There was a problem.
[0005]
In addition, when a contact plate is installed on the bolt box of the segment ring, and this contact plate is fixed with a bolt and a nut and joined, the load applied to the segment ring is received by the bolt. It is necessary to considerably increase the number of bolts.
[0006]
However, since the number of bolts cannot be increased so much due to the size of the bolt box, etc., the range of use must be limited, for example, it is usually used for joining portions where a relatively small load is applied. Furthermore, in the case of directly joining reinforcing bars, a large number of reinforcing bars must be joined, so that there is a problem that the work is troublesome and the construction period becomes long.
[0007]
An object of the present invention is to solve such problems, and it is possible to improve reliability by eliminating welding defects, and to apply to a portion where a large load is applied. and to provide a concrete structure capable of reducing.
[0008]
[Means for Solving the Problems]
The present invention is a concrete structure and is configured as follows in order to solve the above-described technical problems. Sunawa Chi surrounds in a cylindrical precast concrete formwork which is divided around the vertical concrete column, joining the split the precast concrete formwork together, between the concrete column and the precast concrete formwork A concrete structure filled with grout,
The precast concrete formwork includes a pair of connecting portions that join the precast concrete formwork together, and a reinforcing bar that is fixed to the pair of connecting portions and disposed inside the precast concrete formwork,
The pair of connecting portions has had the inner side or the L-shaped engaging portion projecting outwardly respectively towards the surface to be the bonding precast concrete formwork together at the tip to the concrete columns,
When the precast concrete molds are joined together, the locking portion is provided to protrude in the opposite direction to the locking portion of the mating connecting portion,
The connecting portion is provided with a gap into which the engaging portion of the mating connecting portion protruding in the opposite direction can be inserted between the surface where the precast concrete molds are joined and the protruding engaging portion ,
When the concrete pillar is surrounded by the concrete formwork, the length of the locking portion in the protruding direction is such that one concrete formwork is first fitted into the concrete pillar, and then the other concrete formwork is placed. It is the length which can be latched in the clearance gap which inserts the said latching | locking part by shifting to the said one concrete mold side, after inserting in a concrete pillar in the state shifted a little sideways .
[0010]
In this concrete structure, for example, the surrounding concrete columns are surrounded by a vertically divided cylindrical concrete formwork, and the constituent parts of these reinforcing members are joined by the above-described joints. Compared with the case where welding is performed on site, welding defects are reduced, so that the reliability is improved and the joining work is facilitated, so that the construction period can be shortened.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the concrete structure of the present invention will be described in detail with reference to the drawings.
[0012]
FIG. 1 shows an earthquake-proof reinforcement column 1 to which a concrete structure according to the present invention is applied. In the seismic reinforcement column 1, the concrete column 11 is surrounded by concrete molds 12 and 13 which are reinforcement members. The concrete pillar 11 has a square cross section, for example, and a reinforcing bar 14 is disposed inside. A gap between the concrete pillar 11 and the concrete molds 12 and 13 is filled with a grout 15.
[0013]
The concrete molds 12 and 13 are obtained by dividing a rectangular tube into two vertically, and each section is formed in a U-shape, and a plurality of strip reinforcing bars 16 and 17 are disposed therein. The concrete molds 12 and 13 are precast and can be joined by a joint 20 described below.
[0014]
The joint 20 is composed of a pair of metal connecting portions 21 and 22 that can be fixed to the steel bars 16 and 17 of the concrete molds 12 and 13 that are members to be joined. These connecting portions 21 and 22 are formed in the same length as the concrete molds 12 and 13.
[0015]
As shown in FIG. 2, L-shaped locking portions 23 and 24 are provided at the distal ends of the connecting portions 21 and 22. Each of these latching | locking parts 23 and 24 protrudes from the joining surface of the concrete formwork 12 and 13, and is arrange | positioned so that it may become the mutually opposite direction. And between each latching | locking part 23 and 24 and the joint surface of the concrete formwork 12 and 13, the clearance gap which can insert the other latching | locking part 24 and 23 is provided. Further, as shown in FIG. 3, the connecting portions 21 and 22 are fastened with bolts 25 and 26 after the locking portions 23 and 24 are locked.
[0016]
When constructing the seismic reinforcement column 1 on the existing concrete column 11, as shown in FIG. 1, first, the concrete molds 12 and 13 are arranged so as to surround the periphery of the existing concrete column 11. The connecting portions 21 and 22 of the joint 20 are fixed to the strip reinforcing bars 16 and 17 of the concrete molds 12 and 13 at the time of manufacture.
[0017]
When the concrete molds 12 and 13 are arranged around the concrete pillars 11, one concrete mold 12 is arranged first, and then the other concrete mold 13 is fitted to the concrete pillars 11 while being slightly shifted laterally. The alignment is shifted to the other side of the concrete formwork 12 side. Thereby, the latching | locking parts 23 and 24 of each connection part 21 and 22 are latched.
[0018]
Next, the grout 15 is filled in the gap between the concrete pillar 11 and the concrete molds 12 and 13. As a result, the grout 15 and the concrete molds 12 and 13 are integrated with the concrete pillar 11 to be seismically reinforced.
[0019]
Since the seismic reinforcement columns 1 can be joined to the precast concrete molds 12 and 13 without welding the joints 20, the field work can be facilitated and the construction period can be shortened. Further, since the joint 20 can be configured by only two of the connecting portions 21 and 22, the number of parts can be reduced. Further, since the connecting portions 21 and 22 can be locked by inserting the locking portions 23 and 24 from the side, even if there is no space above the concrete column 11, the concrete formwork 12 and 13 is attached to the concrete column 11. Can be attached.
[0020]
In addition, since the connecting portions 21 and 22 are fixed to the strip reinforcing bars 16 and 17 when the concrete molds 12 and 13 are manufactured, the welding is poor compared to the conventional case where the reinforcing bars 16 and 17 are welded and joined on site. The reliability is improved because of the decrease.
[0021]
Since the joint 20 can arbitrarily set the shapes and dimensions of the connecting portions 21 and 22, and thereby can have the same or higher strength than the strip reinforcing bars 16 and 17 of the concrete molds 12 and 13, It can be applied to a wide range of joints where large loads are applied.
[0022]
In addition, although the above-mentioned embodiment demonstrated the case where the cross section of the concrete pillar 11 was a rectangle, it is applicable not only to this but to the concrete pillar of cross sections, such as a polygon or a circle. Moreover, although the case where the cross section of the concrete molds 12 and 13 which are reinforcement members was made into U shape was demonstrated, it can be made into appropriate shapes, such as L shape.
[0023]
【The invention's effect】
As described above, according to the concrete structure of the present invention, since it can be constituted by only two connecting portions, the number of parts can be reduced and the cost can be reduced. Further, since the L-shaped locking portion can be locked by aligning and arranging the connecting portions from the side, even if there is no space above the members to be bonded, the bonding can be easily performed.
[0024]
In the concrete structure of the present invention, for example, the surrounding concrete pillars are surrounded by a reinforcing member such as a precast vertically divided concrete formwork, and each component of these reinforcing members is connected to the above-described joint. Therefore, the welding failure is reduced and the reliability is improved as compared with the case of joining by welding in the field as in the prior art, and the work can be shortened because the joining work is facilitated.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a seismic reinforcing column to which a concrete structure according to the present invention is applied.
FIG. 2 is a perspective view showing a fitting state of the joint according to the present invention.
FIG. 3 is a cross-sectional view showing a coupling state of the joint according to the present invention.
[Explanation of symbols]
1 Seismic reinforcement column (concrete structure)
11 Concrete pillars 12 and 13 Concrete formwork (reinforcement member)
15 Grout 20 Joint 21, 22 Connecting portion 23, 24 Locking portion

Claims (1)

The periphery of the concrete pillar was surrounded by a vertically divided cylindrical precast concrete formwork, the divided precast concrete formwork was joined together, and grout was filled between the concrete pillar and the precast concrete formwork. A concrete structure,
The precast concrete formwork includes a pair of connecting portions that join the precast concrete formwork together, and a reinforcing bar that is fixed to the pair of connecting portions and disposed inside the precast concrete formwork,
The pair of connecting portions has had the inner side or the L-shaped engaging portion projecting outwardly respectively towards the surface to be the bonding precast concrete formwork together at the tip to the concrete columns,
When the precast concrete molds are joined together, the locking portion is provided to protrude in the opposite direction to the locking portion of the mating connecting portion,
The connecting portion is provided with a gap into which the engaging portion of the mating connecting portion protruding in the opposite direction can be inserted between the surface where the precast concrete molds are joined and the protruding engaging portion ,
When the concrete pillar is surrounded by the concrete formwork, the length of the locking portion in the protruding direction is such that one concrete formwork is first fitted into the concrete pillar, and then the other concrete formwork is placed. A concrete structure characterized by having a length that can be fitted into a concrete column with a slight shift to the side and then shifted to the one concrete mold side to be locked in a gap into which the locking portion is inserted .

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