JP6774778B2 - Assembled concrete columns and their joining methods - Google Patents

Description

The present invention relates to an assembling concrete column in which a lower column and an upper column are joined by a steel pipe for joining, and a method for joining the same.

Since a concrete pole generally used as a utility pole or the like has an elongated cylindrical shape of 10 to 16 m, a long and heavy so-called single concrete pole cannot be used on a narrow road.

Therefore, as a concrete column that can be constructed even in a narrow space, it is known that the concrete upper column and the concrete lower column are in a state where the end faces are butted against each other, and the flange is fixed with bolts in a connected state. (See, for example, Patent Document 1).

Further, there is known a structure in which a concrete upper pillar and a concrete lower pillar are connected with their end faces facing each other, and a cover member is provided so as to cover the connecting portion (for example, a patent). See references 2 and 3).

Japanese Unexamined Patent Publication No. 2008-101325 Jitsukaisho 61-8206 JP-A-2008-240667

In the configuration in which the connected state is fixed with bolts as in Patent Document 1 described above, torque management is required at the time of joining, which may take a long time and cannot be easily installed.

Further, in the configuration in which the connecting portion between the upper pillar and the lower pillar is covered with the cover member as in Patent Documents 2 and 3 described above, a step or a gap is formed at the boundary portion between the upper pillar and the cover member, so that the upper pillar is formed. It is conceivable that moisture such as rain easily enters the boundary portion between the cover member and the cover member, and the moisture easily causes corrosion of the upper pillar and the cover member.

The present invention has been made in view of these points, and an object of the present invention is to provide an assembling concrete column that can be easily installed and is less likely to cause corrosion, and a method for joining the same.

The assembly-type concrete column according to claim 1 has an upper column made of concrete and a tapered portion having a gradually increasing diameter downward in a certain range of at least the upper end portion, and the upper end surface is on the lower end surface of the upper column. It is provided with a concrete lower column facing the lower column and a joint steel pipe integrated with the lower end of the upper column and fitted to the tapered portion of the lower column, and the joint steel pipe is the said of the lower column. the Rukoto be in close contact with the concrete is fitted in the tapered portion forms an outer peripheral surface of the tapered portion, the upper pillar and said lower pillar is intended to be joined.

The assembly-type concrete column according to claim 2 is the assembly-type concrete column according to claim 1. In the assembly-type concrete column according to claim 1, the steel pipe for joint is integrally molded at the lower end of the upper column and is integrally molded with the outer peripheral surface of the upper column. And a fitting portion to be fitted to the tapered portion of the lower pillar.

The assembled concrete column according to claim 3 is the assembled concrete column according to claim 1, wherein the upper column has a seat plate integrally provided at the lower end portion, and the steel pipe for joint is the seat plate. It is welded to the upper pillar and integrated with the upper pillar via the seat plate.

The assembled concrete column according to claim 4 is the assembled concrete column according to any one of claims 1 to 3, wherein the upper column and the lower column are joined to the lower end portion of the upper column and the said. It is separated from the upper end of the tapered portion of the lower pillar .

The assembled concrete column according to claim 5 is the assembled concrete column according to any one of claims 1 to 4, wherein the upper column has a seat plate at an end on the joint side with the lower column and is a seat. The end of the PC steel is fixed to the plate and prestress is applied to the end of the concrete part.

The method for joining the assembly-type concrete columns according to claim 6 is a method for joining the assembly-type concrete columns according to claim 2 , wherein the upper and lower columns of the assembly-type concrete columns are joined by a steel pipe for joining. by molding the upper pillar with a portion previously installed was of the fitting for steel pipe in the mold frame which corresponds to the lower end of the upper column, integral with said on pillars and the fitting for steel pipe in the mold It is integrated by molding.

Bonding method has been prefabricated concrete column according to claim 7 is the method of joining prefabricated concrete pillars to be joined by fitting for steel pipe and the bar and a lower column on the prefabricated concrete column according to claim 3, wherein the molded pillars in a state of pre-established the seat plate in the mold frame which corresponds to the lower end surface of the upper column, and welding the seat plate steel for the joint, the upper pillar through the seat plate And the steel pipe for joints are integrated.

According to the present invention, the steel pipe for joints is integrated with the lower end of the upper column and is fitted to the tapered portion of the lower column to be in close contact with the concrete forming the outer peripheral surface of the tapered portion. Moisture does not easily enter the boundary with the steel pipe, and corrosion due to moisture can be prevented, and installation is easy.

It is sectional drawing which shows the structure of the assembly type concrete column which concerns on 1st Embodiment of this invention. It is sectional drawing which shows the structure of the assembly type concrete column which concerns on 2nd Embodiment of this invention.

Hereinafter, the configuration of the first embodiment of the present invention will be described in detail with reference to FIG.

As shown in FIG. 1, the assembling type concrete pillar 1 used as a concrete electric pillar or the like has a prestressed concrete upper pillar 3 having a tapered portion 2 having a gradually increasing diameter toward the bottom, and a tapered portion of the upper pillar 3. It has a lower column 5 made of prestressed concrete having a tapered portion 4 having a gradually increasing diameter toward the bottom continuous with 2.

The upper pillar 3 and the lower pillar 5 are installed so that the lower end surface of the upper pillar 3 and the upper end surface of the lower pillar 5 face each other, and have the same slope as the tapered portions 2 and 4 of the upper pillar 3 and the lower pillar 5. The shape-shaped joint steel pipe 6 is integrated with the lower end of the tapered portion 2 of the upper column 3 and fitted to the upper end of the tapered portion 4 of the lower column 5. The lower end of the lower pillar 5 is built in the ground, which is the installation surface of the assembly type concrete pillar 1.

The upper pillar 3 and the lower pillar 5 are made of prestressed concrete on which a PC steel material 7 as a tensioning material is arranged.

Further, the seat plate 8 which is the end face metal fitting of the configuration is integrated with the upper end surface located at one end in the axial direction of the upper pillar 3 and the lower end surface located at the other end in the axial direction, and the shaft of the lower pillar 5 A seat plate 9 which is a steel end face metal fitting is integrated with an upper end surface located at one end in the direction and a lower end surface located at the other end in the axial direction.

The seat plates 8 and 9 are provided with engaging holes (not shown), and the end portions of the PC steel material 7 are inserted into the engaging holes and fixed. That is, the PC steel materials 7 arranged on the upper pillar 3 and the lower pillar 5 are inserted into and fixed to the seat plates 8 and 9 arranged in advance in the mold at the time of centrifugal molding by the manufacturing method described later. Prestress is applied with.

The joint steel pipe 6 has an integrally molded portion 11 located on the upper side, which is one side in the axial direction, and a fitting portion 12 located on the lower side, which is the other side of the integrally molded portion 11 in the axial direction. ..

When the upper pillar 3 is molded, the integrally molded portion 11 is arranged in advance at a corresponding portion in the mold and is integrally molded with the concrete pillar. That is, the joint steel pipe 6 is integrated by integrally molding the integrally molded portion 11 with the tapered portion 2 of the upper column 3 in the formwork. The integrally molded portion 11 integrated with the upper pillar 3 has a tapered shape whose outer peripheral surface is continuous with the outer peripheral surface of the tapered portion 2 of the upper pillar 3.

The fitting portion 12 can be fitted to the tapered portion 4 of the lower pillar 5, and after the integrally molded portion 11 is integrally molded with the upper pillar 3, the joint steel pipe 6 is lowered toward the lower pillar 5 together with the upper pillar 3. Then, the tapered portion 4 of the lower pillar 5 is inserted into the fitting portion 12 of the joint steel pipe 6 and fitted.

In the joint steel pipe 6 integrated with the tapered portion 2 of the upper column 3 and fitted to the tapered portion 4 of the lower column 5, the seat plate 8 of the upper column 3 and the seat plate of the lower column 5 are used. 9 is opposed to each other in a separated state. That is, the upper pillar 3 and the lower pillar 5 are not in contact with each other.

Further, the joint steel pipe 6 preferably has substantially the same bending rigidity and bending strength equal to or higher than the mating portions of the upper column 3 to be integrated and the lower column 5 to be fitted, and the upper column 3 It is preferable that approximately half of the tapered portion 2 is attached to the tapered portion 4 of the lower pillar 5.

The flexural rigidity is the product of the moment of inertia of area and Young's modulus, represents the degree to which bending deformation is difficult, and is adjusted so as to be the same as the concrete column by the degree to reduce the steel pipe thickness of the joint steel pipe 6. On the other hand, the bending strength represents the bending stress when a permanent strain is generated in the material, and the material is selected so that the joint steel pipe 6 does not bend and break before the concrete column within a range in which substantially the same bending rigidity can be obtained. To do.

The upper pillar 3 has a tapered structure in which the tapered portion 2 is provided over the entire axial direction, but if the joint steel pipe 6 is integrated at the lower end portion, the tapered portion 2 is provided. In the case where the upper column 3 is provided with the tapered portion 2, the tapered portion 2 is formed only in a certain range of the lower end portion where the joint steel pipe 6 is integrated. It may be configured.

Further, the lower column 5 may have a configuration in which the tapered portion 4 is formed only in a certain range of the upper end portion into which the steel pipe 6 for fitting is fitted.

In short, if the structure has a tapered portion 4 having a gradually increasing diameter downward only in a certain range of the lower pillar 5 to which the joint steel pipe 6 is fitted, the lower pillar 5 to which the joint steel pipe 6 is not fitted is not fitted. The portion and the upper pillar 3 may be formed in a straight shape.

Next, a method of joining the assembled concrete columns 1 will be described.

In the formwork of a centrifugal molding machine or the like, a seat plate 8 is installed so as to correspond to the end portion of the upper pillar 3, a steel pipe 6 for a joint is installed so as to correspond to the lower end portion of the upper pillar 3, and the inside of the formwork. The PC steel material 7 is installed in the seat plate 8 and the end portion of the PC steel material 7 is fixed to the seat plate 8.

With each member installed in the formwork in this way, the upper column 3 is formed by molding the upper column 3 with the formwork while applying prestress to the PC steel material 7, and the upper column 3 and the steel pipe for joints are formed. Integrate with 6.

Further, a seat plate 9 is arranged in a mold of a centrifugal molding machine or the like so as to correspond to the upper end of the lower pillar 5, a PC steel 7 is installed in the mold, and the end of the PC steel 7 is seated. While fixed to the plate 9, the lower pillar 5 is molded by the formwork while applying prestress to the PC steel material 7.

After curing the concrete of the upper pillar 3 and the lower pillar 5 molded by the formwork, the upper pillar 3 and the lower pillar 5 are removed from the mold.

Then, these upper columns 3 and lower columns 5 are joined via a steel pipe 6 for joints to construct an assembly-type concrete column 1. The work of constructing the assembly type concrete pillar 1 is performed using a pillar wheel.

When constructing the assembly type concrete pillar 1, first, the lower pillar 5 is built in the ground which is the installation surface.

Further, the upper pillar 3 in which the steel pipe 6 for the joint is integrated is lifted by a pillar wheel, the lower end surface of the upper pillar 3 and the upper end surface of the lower pillar 5 face each other, and the upper end portion of the lower pillar 5 is set to the upper pillar 3. The upper pillar 3 is lowered so as to be inserted into the joint steel pipe 6 integrated with the lower end portion of the above.

Further, when lowering the upper pillar 3, a mark (not shown) such as a linear mark provided on the outer peripheral surface of the upper pillar 3 or the steel pipe 6 for joint and a linear shape (not shown) provided on the outer peripheral surface of the lower pillar 5 are provided. The upper pillar 3 is aligned with the lower pillar 5 built on the installation surface with reference to the mark such as.

In this aligned state, the upper column 3 is further lowered, and the tapered inner peripheral surface of the joint steel pipe 6 integrated with the upper column 3 is the outer periphery of the tapered portion 4 of the lower column 5 having the same slope. Fit so that it is in close contact with the surface.

Next, the effect of the first embodiment will be described.

Since the assembling type concrete column 1 can be transported by dividing the upper column 3, the steel pipe 6 for joints, and the lower column 5, it can be transported, delivered, and constructed even in a narrow place.

Further, since the steel pipe 6 for joints is integrated with the lower end portion of the upper pillar 3, the upper pillar 3 and the lower pillar 5 are easily aligned with each other with reference to a mark or the like provided on the outer peripheral surface, and then as it is. The upper pillar 3 and the lower pillar 5 can be joined only by lowering the upper pillar 3 and fitting the joint steel pipe 6 and the lower pillar 5. That is, the upper column 3 and the lower column 5 can be joined via the joint steel pipe 6 only by lowering the upper column 3 and the joint steel pipe 6, and bolt tightening work is not required. Therefore, it is necessary to manage the bolt tightening torque. Easy to install.

Further, since the joint steel pipe 6 and the upper pillar 3 are integrated, it is possible to prevent moisture such as rain from entering the boundary portion between the joint steel pipe 6 and the upper pillar 3, and the moisture enters the upper part. Corrosion of the column 3 and the steel pipe 6 for the joint can be prevented.

In particular, the joint steel pipe 6 has a structure in which the integrally molded portion 11 is integrally molded with the tapered portion 2 of the upper pillar 3 and the integrally molded portion 11 and the outer peripheral surface of the upper pillar 3 are continuous. Steps and gaps are unlikely to occur at the boundary between the upper pillar 3 and the upper pillar 3, and corrosion of the upper pillar 3 and the joint steel pipe 6 due to moisture can be effectively prevented.

Further, in the configuration in which the integrally molded portion 11 is integrally molded with the upper pillar 3, the integrally molded portion 11 of the joint steel pipe 6 may be installed and molded in advance in the mold for molding the upper pillar 3, so that the existing one is existing. It can be easily manufactured using equipment.

Further, by designing the joined upper pillar 3 and the lower pillar 5 to face each other in a separated state in the joint steel pipe 6, the upper pillar 3 and the lower pillar 5 and the lower pillar 5 in the built-in state are designed to face each other. The joint steel pipe 6 and the lower column 5 can be reliably fitted by simply lowering the joint steel pipe 6. That is, for example, in a configuration in which the lower end surface of the upper column 3 and the upper end surface of the lower column 5 are abutted in the joint steel pipe 6, the lower column 5 is completely fitted to the joint steel pipe 6. There is a possibility that the lower end surface of the upper pillar 3 and the upper end surface of the lower pillar 5 come into contact with each other before, but the joint steel pipe 6 is attached to the lower pillar 5 with the upper pillar 3 and the lower pillar 5 separated from each other. If it is configured to be fitted, it is possible to prevent the upper pillar 3 and the lower pillar 5 from coming into contact with each other and hindering the fitting before being fitted.

Further, since concrete is generally cheaper than steel, the assembled concrete column 1 is a steel portion as compared with a composite column in which a steel upper column is fitted to a concrete lower column, for example. It is possible to suppress the increase in cost due to the application of steel.

Further, in general, steel is more easily corroded than concrete, and when corrosion occurs, it is necessary to replace the entire corroded member. However, the assembled concrete column 1 is made of steel as compared with the above-mentioned composite column. Since there are few parts made of steel, it is possible to prevent an increase in maintenance frequency due to the large number of parts made of steel.

In the first embodiment, the upper pillar 3 and the lower pillar 5 are joined to form a combination of two concrete pillars, but the configuration is not limited to this, and for example, the upper pillar 3 The number of concrete columns to be combined can be appropriately changed, such as a configuration in which a middle column is joined between the column 5 and the lower column 5 and three concrete columns are combined.

Next, the second embodiment will be described with reference to FIG. The same configurations and operations as those of the first embodiment are designated by the same reference numerals, and the description thereof will be omitted.

In the assembled concrete column 21 according to the second embodiment, the joint steel pipe 24 is, for example, completely melt-welded to the seat plate 23 of the upper column 22 with respect to the first embodiment, and the seat plate 23 is formed. The upper pillar 22 and the joint steel pipe 24 are integrated with each other, and the joint steel pipe 24 is fitted to the lower pillar 5.

Further, a reinforcing band 25 is provided from the seat plate 23 to the lower end of the upper pillar 22. The reinforcing band 25 is fillet welded to the seat plate 23.

When manufacturing such an assembly-type concrete column 21, a reinforcing band 25 is fillet welded on the upper side of the peripheral edge of the seat plate 23.

Further, the seat plate 23 and the reinforcing band 25 are installed in advance at the corresponding positions in the form for molding the upper pillar 22, the PC steel material 7 is arranged, and the end portion of the PC steel material 7 is fixed to the seat plate 23. In this state, the upper pillar 22 is molded while applying prestress.

Further, the joint steel pipe 24 is completely melted and welded to the lower side of the peripheral edge of the seat plate 23 of the upper pillar 22 after molding, so that the upper pillar 22 and the joint steel pipe 24 are integrated via the seat plate 23. ..

Then, the joint steel pipe 24 integrated with the upper column 22 via the seat plate 23 by welding is fitted to the lower column 5 in the same manner as in the first embodiment.

According to this assembling type concrete pillar 21, the joint steel pipe 24 is welded to the seat plate 23 of the upper pillar 22 after the upper pillar 22 is molded, so that the joint steel pipe 24 is transferred to the upper pillar 22 via the seat plate 23. The upper pillar 22 and the steel pipe 24 for the joint can be easily integrated without using special equipment, and the steel pipe 24 for the joint can be made smaller than that of the first embodiment. The size of the part can be minimized.

1 Assembled concrete column 3 Upper column 4 Tapered part 5 Lower column 6 Steel pipe for fitting
11 Integrated molding part
12 Fitting part
21 Assembled concrete columns
22 Upper pillar
23 Seat plate
24 Steel pipe for fittings

Claims (7)

With a concrete upper pillar
A concrete lower pillar having a tapered portion having a gradually increasing diameter toward the lower side in a certain range of at least the upper end portion and having the upper end surface facing the lower end surface of the upper pillar.
A joint steel pipe integrated with the lower end of the upper column and fitted to the tapered portion of the lower column is provided.
The Rukoto be adhered to concrete the joint for steel pipes forms an outer peripheral surface of the tapered portion is fitted into the tapered portion of the lower pillar, said upper pillars and said lower pillars characterized in that it is joined Assembled concrete columns. The steel pipe for joints is characterized by having an integrally molded portion integrally molded at the lower end portion of the upper column and continuous with the outer peripheral surface of the upper column, and a fitting portion fitted to the tapered portion of the lower column. The assembled concrete column according to claim 1. The upper pillar has a seat plate integrally provided at the lower end portion, and has a seat plate.
The assembled concrete column according to claim 1, wherein the steel pipe for a joint is welded to the seat plate and integrated with the upper column via the seat plate. Any one of claims 1 to 3 , wherein the lower end portion of the upper pillar and the upper end portion of the tapered portion of the lower pillar are separated from each other in a state where the upper pillar and the lower pillar are joined. Assembled concrete columns described . The upper pillar has a seat plate at the end on the joint side with the lower pillar, and the end of the PC steel material is fixed to the seat plate and prestress is applied to the end of the concrete part.
The assembled concrete column according to any one of claims 1 to 4, wherein the assembly type concrete column is characterized in that. The method for joining an assembling concrete column according to claim 2, wherein the upper column and the lower column of the assembling concrete column are joined by a steel pipe for joining.
By molding the upper pillar with a portion previously installed was of the fitting for steel pipe in the mold frame which corresponds to the lower end of the upper column, integral with said on pillars and the fitting for steel pipe in the mold joining method set Tatsushiki concrete column you characterized in that integrated by molding. The method for joining an assembling concrete column according to claim 3, wherein the upper column and the lower column of the assembling concrete column are joined by a steel pipe for joining.
The upper pillar is molded with the seat plate installed in advance in the formwork corresponding to the lower end surface of the upper pillar.
And welding the seat plate steel for the joint set Tatsushiki bonding method concrete columns characterized by integrating the said fitting for steel pipe and the upper pillar through the seat plate.

Images