JP5061260B1 - Existing steel pipe column reinforcement and its construction method - Google Patents

Abstract

An object of the present invention is to provide an existing steel pipe column stiffener that can reinforce the outside and inside of an existing steel pipe column and has high strength, is less likely to leak filled mortar, has a good appearance, and is easy to construct.
SOLUTION: A reinforcing pipe 2 that surrounds an outer periphery in the vicinity of the ground surface portion of an existing steel pipe column 1 and a mortar filling space 14 is formed between the existing steel pipe column 1 and an interior of the existing steel pipe column 1 in the vicinity of the ground surface portion. It is provided with a plurality of reinforcing longitudinal members 3 inserted along the vertical direction, and the reinforcing pipe 2 is composed of a pair of half pipes 7 divided into two in the circumferential direction. A plurality of through holes 11 are formed in the underground portion of the reinforcing pipe 2 at appropriate intervals in the circumferential direction, and are aligned with the centering screw. 12 is screwed in from the outside to the inside, and a plurality of reinforcing ribs 8 are mounted on the inner surface of the reinforcing tube 2 along the vertical direction.
[Selection] Figure 3

Description

  The present invention is an existing steel pipe column that is used for a park street light, a road lamp, etc., and has an opening for inspection of electrical parts. The present invention relates to a material and its construction method.

When exposed to wind and rain for a long time, steel pipe columns installed in parks and roads are often corroded and partially damaged or their strength decreases. In particular, the vicinity of the surface portion of the steel pipe column is a part that is most susceptible to corrosion due to the adverse effects of moisture and accumulated water. If this part is corroded, there is a concern that the entire steel pipe column may fall down due to strong winds or the like.
In order to cope with such a situation, conventionally, various techniques for reinforcing a corroded portion generated near the surface portion of an existing steel pipe column have been proposed.
For example, in Patent Document 1, a corrosion prevention reinforcing material that is composed of two halved steel pipe columns and surrounds the vicinity of the ground surface portion of an existing steel pipe column, and a plurality of U-shaped receivers attached to the inner surface of the corrosion prevention reinforcement material. The material and the web portion are inserted into the groove portion of the U-shaped receiving material, and the flange portion is filled in the gap between the plurality of T-shaped reinforcing materials facing the existing steel pipe columns and the existing steel pipe columns and the corrosion prevention reinforcing materials. An existing steel pipe column corrosion prevention reinforcement provided with reinforcement mortar is described.

However, since this existing steel pipe column corrosion prevention reinforcing material does not have means for reinforcing the inside of the existing steel pipe column, it is difficult to obtain sufficient strength, and it is difficult to prevent corrosion that proceeds from the internal space of the existing steel pipe column. .
In addition, since the two half steel pipe columns are connected by a fixed band or shape retaining plate attached to a part of the outer surface, the reinforcing mortar filled in the gap between the existing steel pipe pillar and the corrosion prevention reinforcing material is half steel pipe Easily leaks from the joints of the pillars to the outside. Furthermore, there is a problem that it is difficult to fix the corrosion prevention reinforcing material concentrically with the existing steel pipe column.

Japanese Patent No. 4448556

  The problem to be solved by the present invention is that the strength and strength of the existing steel pipe column can be reinforced, the mortar filled between the existing steel pipe column and the reinforcing pipe is less likely to leak, the appearance is good, and the existing steel pipe is easy to construct It is in providing a column reinforcement and its construction method.

The existing steel pipe column reinforcing material of the present invention includes a reinforcing pipe that surrounds the outer periphery in the vicinity of the ground surface portion of an existing steel pipe column having an opening for electrical component inspection, and in which a mortar filling space is formed between the existing steel pipe column and , Mortar filled in the mortar filling space, a plurality of reinforcing vertical members inserted along the vertical direction in the vicinity of the ground surface portion of the existing steel pipe column, and the interior in the vicinity of the ground surface portion of the existing steel pipe column A mortar in which the reinforcing longitudinal member is embedded , and the reinforcing pipe is composed of a pair of half pipes divided in the circumferential direction, and these half pipes abut both ends in the circumferential direction. A plurality of through-holes are formed at appropriate intervals in the circumferential direction in the underground portion of the reinforcing pipe, and a centering screw is provided in the through-hole. Screwed from outside to inside Is, a plurality of reinforcing ribs along the vertical direction on the inner surface of the reinforcing tube is attached.
The reinforcing rib may be welded to the inner surface of the reinforcing pipe.
It is desirable that one end portion of the backing plate is welded to the inner surface of one end portion in the circumferential direction of the half pipe.

The method for constructing an existing steel pipe column reinforcing material according to the present invention includes covering the outer peripheries in the vicinity of the surface portion of an existing steel pipe column having an opening for inspecting electrical parts, and further joining the half pipes. Then, the tip of the centering screw is brought into contact with the outer peripheral surface of the existing steel pipe column, and the lengths of the centering screws exposed to the outside of the reinforcing tube are all adjusted to be the same. While aligning the center with the center of the existing steel pipe column, fixing the reinforcing pipe to the existing steel pipe column, then filling the mortar filling space with mortar, and inside the existing steel pipe column below the reinforcing pipe, Sand is filled through the opening, and then the vertical steel support mortar is filled through the opening into the existing steel pipe column at a height from the top surface of the sand to the inner lower portion of the reinforcing pipe. Material support mortar Before hardening, the reinforcing vertical member is inserted through the opening in the vicinity of the ground surface portion of the existing steel pipe column, and the reinforcing vertical member is implanted in the vertical member supporting mortar, and then the vertical member Above the supporting mortar, mortar is filled through the opening into the vicinity of the surface portion of the existing steel pipe column.
Before filling the sand, at least a portion in the vicinity of the ground portion of the electric wire wired inside the existing steel pipe column may be covered with a protective tube.

According to the first aspect of the invention, since the outside and the inside of the surface portion of the existing steel pipe column that is easily corroded are reinforced, the decrease in the strength of the existing steel pipe column due to corrosion is sufficiently compensated, and the risk of collapse or the like is ensured. The durability of existing steel pipe columns can be increased and the cost required for column replacement can be reduced.
In addition, even before the reinforcing pipe and the existing steel pipe column are joined with mortar, it can be temporarily fixed with the centering screw, so the workability on the site is improved, and the centering screw is advanced and retracted. It is easy to install the reinforcing pipe concentrically with the existing steel pipe column, and as a result, the thickness of the mortar filling space is made uniform, so that the strength does not vary and the appearance after reinforcement is uncomfortable. Hard to occur.
In addition, since the backing plate is stacked on the inner surface of the butt section of the half pipe, the mortar filled in the mortar filling space is difficult to leak from the butt section to the outside of the reinforcing pipe, and the outer surface of the reinforcing pipe is not soiled with mortar. Is good.

According to the invention which concerns on Claim 2, since it is not necessary to attach a reinforcement rib to the inner surface of a reinforcement pipe | tube on the spot, the operation | work on the spot is simplified.
According to the third aspect of the present invention, on-site work is only required to be fixed to one half plate by screwing or the like, so that on-site work is further facilitated.
According to the invention of claim 4, it is possible to easily reinforce the vicinity of the ground surface portion of the existing steel pipe column from the outside and inside without requiring skilled work, and finish the appearance after reinforcement in a good manner. Can do.
According to the invention which concerns on Claim 5, it can prevent that the electric wire wired inside the existing steel pipe column is damaged by the operation | work performed inside the existing steel pipe column.

The perspective view after reinforcement of the illuminating lamp which concerns on the Example of this invention. The principal part perspective view in the reinforcement material installation state of the illuminating lamp which concerns on the Example of this invention. Sectional drawing after the reinforcement of the illuminating lamp which concerns on the Example of this invention. The principal part perspective view of the half pipe which concerns on the Example of this invention. The perspective view of the reinforcing vertical member which concerns on the Example of this invention. The perspective view which shows the 1st process of the construction method which concerns on the Example of this invention. The perspective view which shows the 2nd process of the construction method which concerns on the Example of this invention. The perspective view which shows the 3rd process of the construction method which concerns on the Example of this invention. The perspective view which shows the 4th process of the construction method which concerns on the Example of this invention. The perspective view which shows the 5th process of the construction method which concerns on the Example of this invention. The perspective view which shows the 6th process of the construction method which concerns on the Example of this invention. The perspective view which shows the 7th process of the construction method which concerns on the Example of this invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
The existing steel pipe column reinforcing material of the present invention reinforces the vicinity of the ground surface of the existing steel pipe column 1 used in an illuminating lamp installed in a park or road, as shown in FIGS. A reinforcing pipe 2 that surrounds the outer periphery in the vicinity of the ground surface portion of the existing steel pipe column 1 and is formed with a mortar filling space 14 having a thickness of about 20 to 40 mm between the existing steel pipe column 1 and the vicinity of the ground surface portion of the existing steel pipe column 1 And a plurality of (four in this embodiment) reinforcing longitudinal members 3 inserted in the vertical direction.
An electric wire 4 is wired inside the existing steel pipe column 1 and electric parts such as ballasts are installed. An opening 5 for checking the electric parts is formed on the outer peripheral wall of the existing steel pipe column 1. ing.
Moreover, the lower part of the existing steel pipe pillar 1 is embed | buried under the foundation concrete 6 laid in the ground.

The reinforcing pipe 2 is a cylindrical body having a height of 400 to 600 mm made of a metal such as steel, and the height and the outer diameter can be appropriately changed according to the dimensions of the existing steel pipe column 1. The lower half of the reinforcing pipe 2 is buried in the ground so that there is a distance of 20 mm or more between the upper end of the reinforcing pipe 2 and the opening 5 of the existing steel pipe column 1.
The reinforcing pipe 2 includes a pair of half pipes 7 whose cross section is divided into two in the circumferential direction. A plurality of (two in this embodiment) reinforcing ribs 8 are mounted on the inner surface of each half pipe 7 along the vertical direction. The reinforcing rib 8 has a T-shaped cross section, and the tip of the web portion is welded to the inner surface of the half pipe 7. In addition, the reinforcing rib 8 is attached to the position arrange | positioned at equal intervals, when a pair of half pipe 7 is joined to cylinder shape. The overhanging dimension of the reinforcing rib 8 is a dimension that allows a sufficient gap between the outer peripheral surface of the existing steel pipe column 1 so as not to partition the mortar filling space 14.

A pair of half pipes 7 are joined together via a backing plate 9 which is abutted at both ends in the circumferential direction and overlapped with the inner surface of the abutting part.
As shown in FIG. 4, one end of the backing plate 9 is welded to the inner surface of one end in the circumferential direction of the half pipe 7. Therefore, as shown in FIG. 3, when the circumferential ends of the pair of half pipes 7 are abutted, the backing plate 9 overlaps the inner surface of the abutting portion. When the end of the half pipe 7 to which the backing plate 9 is not welded is fixed with the fixing screw 10, the pair of half pipes 7 can be easily joined.

In addition, a plurality of (four in this embodiment) through holes 11 are formed in the underground portion of the reinforcing pipe 2 at equal intervals in the circumferential direction, and centering screws 12 are respectively inserted into the through holes 11 from the outside to the inside. Screwed toward.
The reinforcing vertical member 3 is a member having an E-shaped cross section made of a metal such as steel and having substantially the same height as the reinforcing pipe 2 as shown in FIG.
And the reinforcing vertical member 3 is arrange | positioned at equal intervals in the circumferential direction of the existing steel pipe column 1 so that one flange may adjoin to the inner surface of the existing steel pipe column 1 (FIG. 3).

In order to reinforce the vicinity of the ground surface of the existing steel pipe column 1 with the existing steel pipe column reinforcing material, first, as shown in FIG. 1 reinforcement part is exposed. The depth of the turned portion 13 of the foundation concrete 6 is set to be slightly deeper than the lower end of the reinforcing pipe 2.
Next, the rust of the reinforcement part of the existing steel pipe column 1 is removed and rust prevention coating is applied.

Next, as shown in FIG. 7, a pair of half pipes 7 are covered from both sides on the outer periphery in the vicinity of the ground surface portion of the existing steel pipe column 1, and these half pipes 7 are joined with fixing screws 10 to form a cylindrical reinforcing pipe 2 is formed. The lower half portion of the reinforcing pipe 2 is arranged inside the turned portion 13 of the foundation concrete 6.
Then, by adjusting the length of the centering screw 12 exposed to the outside of the reinforcing pipe 2 by moving the centering screw 12 forward and backward to bring its tip into contact with the outer peripheral surface of the existing steel pipe column 1, The center of the reinforcing pipe 2 is aligned with the center of the existing steel pipe column 1 and the reinforcing pipe 2 is fixed to the existing steel pipe column 1. Thereby, the mortar filling space 14 of uniform thickness is formed between the reinforcing pipe 2 and the existing steel pipe column 1.

Next, a lid for closing the opening 5 is opened, and through the opened opening 5, as shown in FIG. 8, at least a portion in the vicinity of the ground surface portion of the electric wire 4 wired inside the existing steel pipe column 1 is protected tube 16. Cover with.
Further, the turned portion 13 of the foundation concrete 6 is filled with the quick drying mortar 17, and the quick drying mortar 18 is filled into the mortar filling space 14.
The upper surface of the quick-drying mortar 17 filled in the turned portion 13 is inclined so as to become higher as it approaches the existing steel pipe column 1.

Next, as shown in FIG. 9, sand 19 is poured into the existing steel pipe column 1 through the opening 5. The sand 19 is filled in the existing steel pipe column 1 so that the upper surface is about 100 mm below the lower end of the reinforcing pipe 2.
After that, as shown in FIG. 10, a quick-drying vertical material supporting mortar 20 is placed in the existing steel pipe column 1 through the opening 5 over a height of about 200 mm from the upper surface of the sand 19 to the inner lower portion of the reinforcing pipe 2. Fill.
Before the vertical member supporting mortar 20 is hardened, the reinforcing vertical member 3 is inserted into the existing steel pipe column 1 through the opening 5, and the reinforcing vertical member 3 is implanted in the vertical member supporting mortar 20 at equal intervals in the circumferential direction. .

Next, as shown in FIG. 11, the quick-drying mortar 21 is filled into the inside of the vicinity of the ground surface portion of the existing steel pipe column 1 above the vertical member supporting mortar 20 through the opening 5. The quick-drying mortar 21 is filled up to a position about 100 mm higher than the upper end of the reinforcing pipe 2, and the reinforcing vertical member 3 is completely embedded therein.
Further, the top surface of the quick-drying mortar 18 filled in the mortar filling space 14 is subjected to waterproofing treatment with modified silicon after applying the primer.
Finally, as shown in FIG. 12, the opening 5 of the existing steel pipe column 1 is closed with a lid 22.

In the example shown in the figure, the existing steel pipe column 1 and the reinforcing pipe 2 are cylindrical. However, if the cross section near the ground surface portion of the existing steel pipe column 1 is square, the reinforcing pipe 2 is also a square tube.
Moreover, according to the dimension of the existing steel pipe pillar 1, the dimension of the reinforcement pipe | tube 2 and the number of the reinforcement vertical members 3 and the reinforcement ribs 8 can also be changed suitably.
Furthermore, the number of the through-holes 11 and the centering screws 12 in the reinforcing tube 2 may be three or more, and the cross-sectional shapes of the reinforcing vertical members 3 and the reinforcing ribs 8 are not limited to the examples shown in the drawings.

DESCRIPTION OF SYMBOLS 1 Existing steel pipe pillar 2 Reinforcement pipe 3 Reinforcement vertical member 4 Electric wire 5 Opening part 6 Basic concrete 7 Half pipe 8 Reinforcement rib 9 Backing board 10 Fixing screw 11 Through-hole 12 Centering screw 13 Turning part 14 Mortar filling space 16 Protection Tube 17, 18, 21 Quick-drying mortar 19 Sand 20 Longitudinal material support mortar 22 Lid

Claims (5)

Surrounds the outer periphery of the ground in the vicinity of the existing steel column having an opening for the electrical component inspection, a reinforcing tube mortar filling space is formed between the existing tubular columns, mortar is filled in the mortar filling space And a plurality of reinforcing vertical members inserted along the vertical direction inside the vicinity of the ground surface portion of the existing steel pipe column, and the inside of the vicinity of the ground surface portion of the existing steel pipe column is filled, and the reinforcing vertical material is inside thereof The reinforcing pipe is composed of a pair of halved pipes divided into two in the circumferential direction. The halved pipes butt at both ends in the circumferential direction and are overlapped on the inner surface of the butt portion. A plurality of through holes are drilled at appropriate intervals in the circumferential direction in the underground portion of the reinforcing pipe, and centering screws are screwed into the through holes from the outside to the inside. On the inner surface of the reinforcing tube Existing steel column reinforcement plurality of reinforcing ribs along the direction is characterized in that it is mounted.   The existing steel pipe column reinforcing material according to claim 1, wherein the reinforcing rib is welded to the inner surface of the reinforcing pipe.   The existing steel pipe column reinforcing material according to claim 1 or 2, wherein one end portion of the backing plate is welded to an inner surface of one end portion in the circumferential direction of the half pipe.   Cover the outer periphery of the surface of the existing steel pipe column having an opening for checking electrical parts with the pair of half pipes, and after joining the half pipes, connect the tip of the centering screw to the existing steel pipe. Adjusting the center of the reinforcing pipe to the center of the existing steel pipe column by making contact with the outer peripheral surface of the column and adjusting the lengths of the centering screws exposed to the outside of the reinforcing pipe to be the same, A reinforcing pipe is fixed to the existing steel pipe column, and then the mortar filling space is filled with mortar, and the sand pipe is filled into the existing steel pipe column below the reinforcing pipe through the opening, and then, The vertical steel support mortar is filled into the existing steel pipe column through the opening at the height from the upper surface of the sand to the inner lower portion of the reinforcing pipe, and before the vertical material support mortar is hardened, the existing steel pipe column The surface part of Inside the side, the reinforcing vertical member is inserted through the opening, and the reinforcing vertical member is implanted in the vertical member supporting mortar, and then the ground surface portion of the existing steel pipe column above the vertical member supporting mortar. The construction method of an existing steel pipe column reinforcing material according to any one of claims 1 to 3, wherein mortar is filled in the vicinity through the opening.   The construction of the existing steel pipe column reinforcing material according to claim 4, wherein at least a portion near the ground surface portion of the electric wire wired inside the existing steel pipe column is covered with a protective pipe before filling with the sand. Method.