JPH09143930A - Column reinforcing structure and elevated bridge using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To perform reinforcement work on bridge piers or the like without performing site welding by providing, at the side ends of reinforcing plates, joints which alternately combine with each other while extending vertically in opposite directions, and connecting the reinforcing plates together through the insertion of rod-shaped members into both of the joints combined. SOLUTION: Joints 6, 6 which alternately combine with each other while extending vertically in opposite directions are provided at the respective side ends of reinforcing plates 4, 5, and round steel rods 7, 7 are passed through both of the combined joints 6 to connect the reinforcing plates 4, 5 together. Thus reinforcing work is completed simply by performing a factory welding operation or the like for attaching the joints 6 to the reinforcing plates 4, 5, then combining the reinforcing plates 4, 5 on-site, and inserting the round steel rods 7 into the joints 6. Therefore, welding strength is not reduced by the influence of wind and rain as in the case of site welding, and a large-scale scaffold that is required in site welding is not necessary.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a column reinforcing structure for reinforcing a bridge pier or the like of a viaduct, and more particularly to a column reinforcing structure in which a reinforcing plate is wound around an outer circumference of the pier or the like.

[0002]

2. Description of the Related Art Girders and bridge piers for viaducts used in railways and roads are often made of reinforced concrete, but in order to improve their seismic strength, reinforcing plates such as steel plates are often wound around the periphery of the piers.

Here, conventionally, in order to wind a reinforcing plate around a bridge pier, the reinforcing plate is previously divided and formed in the circumferential direction of the pier, and these reinforcing plates are combined in a tubular shape so as to surround the pier at a work site, Each combination part (side end part of each reinforcing plate) was welded.

[0004]

However, such a method of in-situ welding has a problem that the quality (strength) of welding tends to deteriorate due to the influence of wind and rain. Further, since it is necessary to construct a relatively large scaffold for performing the welding work, there is a problem that the construction period is extended and the construction cost is increased.

The present invention has been made in view of the above problems, and provides a column reinforcing structure capable of performing a reinforcing work for a bridge pier or the like without performing on-site welding, and a viaduct using the same. Is intended.

[0006]

In order to achieve the above object, in the present invention, in a column reinforcing structure in which a plurality of reinforcing plates are combined in a tubular shape and wound around the outer periphery of the columnar body,
At the side end portion of each reinforcing plate, a joint that is alternately combined with the other side in the vertical direction is provided, and a rod-shaped member is inserted through each of the combined joints to connect the reinforcing plates.

Specifically, a joint in which convex portions projecting outward in the circumferential direction of the reinforcing plate and concave portions are alternately arranged in the vertical direction is used, and the convex portion of the joint on the adjacent reinforcing plate side is provided in each concave portion. By accepting, the joints of both reinforcing plates are alternately combined, and the rod-shaped member is inserted into the through hole formed in each convex portion.

Thus, in the present invention, the welding work for attaching the joint to the reinforcing plate is performed in the factory, and then the reinforcing plates are assembled on site, and the reinforcing work is completed by inserting the rod member into the joint. As a result, connection strength is secured without being affected by wind and rain, and there is no need to build a large overhanging scaffold.

In order to smoothly insert the rod-shaped member, the inner diameter of the through hole of the rod-shaped member in the joint can be made larger than the outer diameter of the rod-shaped member to some extent. Therefore, after the insertion of the rod-shaped member, the through-hole and the rod-shaped member are inserted. It is desirable to fill cement in the gap formed between and to connect the reinforcing plate more firmly.

If the columnar body has a prismatic shape,
It is preferable to set the connecting portion of the joint to a position where the insertion work of the rod-shaped member can be easily performed, such as a position facing the side surface of the columnar body or a position facing the corner of the columnar body.

Further, when a plurality of reinforcing cylinders thus combined in a cylindrical shape are arranged in the vertical direction of the columnar body, the circumferential positions of the joints in these reinforcing cylinders may be made different from each other, for example, It is desirable that the joint in the lower reinforcing cylinder does not interfere with the insertion work from below of the rod-shaped member in the upper reinforcing cylinder.

It is desirable that the thickness of the joint should be equal to or larger than the thickness of the reinforcing plate so that the tensile strength can be prevented from lowering even if the joint formed in the concavo-convex shape as described above is used.

Then, it is desirable to reinforce the bridge piers by using the above-mentioned column reinforcing structure to form a viaduct having a short construction period and a low construction cost, and having high earthquake resistance which is not affected by the welding quality of the reinforcing plate. .

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a railroad viaduct made of reinforced concrete, which uses a column reinforcing structure according to the present invention. In this figure, 1 is a pier and 2 is a bridge girder supported by the pier. A rail (not shown) is laid on the upper surface of the bridge girder 2, and the train runs on this rail.

As shown in detail in FIG. 2, the pier 1 is formed in the shape of a prism having a rectangular cross section, and a rectangular tubular reinforcing cylinder 3 is wound around the outer periphery of the pier 1. The reinforcing tube 3 is formed by combining two reinforcing plates 4 and 5 that are bent and formed into a C-shape in a plan view at the center in the circumferential direction on the side surface of the pier 1 and combining them into a rectangular tube shape. Each of the reinforcing plates 4 and 5 is made of a steel plate, and a joint 6 is attached to its circumferential end (side end).

As shown in detail in FIG. 3, the joint 6 is a main body portion 6a which is butt-welded to the side end surfaces of the reinforcing plates 4 and 5.
And a cylindrical connecting portion (convex portion) 6b which is attached to the side end portion of the main body portion 6a by butt welding and has a through hole 6c formed therein. Body part 6
As shown in FIG. 4, a is made of a single steel plate extending over the entire length in the vertical direction of the reinforcing plates 4 and 5. The connecting portion 6b is
A plurality of through holes 6c are attached to the side end portions of the reinforcing plates 4 and 5 in a direction extending in the vertical direction of the reinforcing plates 4 and 5 at equal intervals in the vertical direction. In addition, the vertical dimension of the connecting portion 6b,
The distance between the connecting portions 6a is equal.

Further, the thickness of each part of the joint 6 depends on the reinforcing plates 4,
It is about 2 to 3 times thicker than the wall thickness of 5. This allows
It is possible to secure the strength of the joint 6 which receives a tensile load in the circumferential direction at a portion corresponding to almost half of the entire length in the vertical direction.
Then, the welding of the reinforcing plates 4 and 5 and the joint 6 and the coating of these are performed in the factory.

The reinforcing plates 4 and 5 thus welded and the entire coating of the joint 6 are carried from the factory to the construction site of the viaduct, where they are assembled in a rectangular tube shape so as to surround the pier 1. At this time, the joints 6 and 6 of the reinforcing plates 4 and 5 are
They are combined so that they are staggered in the vertical direction. That is, the connecting portion 6b of the other joint 6 is received between the connecting portions 6b and 6b of the one joint 6 (recess). As a result, the connecting portion 6b of both joints 6 and 6 is
The reinforcing plates 4 and 5 are connected in a pipe shape extending over the entire length in the vertical direction, and the through hole 6c inside thereof is also a hole.

Then, the reinforcing plates 4, 5 are provided in the through holes 6c.
A round steel rod (bar-shaped member) 7 having a length substantially the same as the vertical dimension is inserted, and both reinforcing plates 4 and 5 are firmly connected to each other by pulling in the circumferential direction.

However, in order to smoothly insert the round steel rod 7 into the through hole 6c, the inner diameter of the through hole 6c is made larger than the outer diameter of the round steel rod 7 to some extent. A gap remains between the outer peripheral surface and the inner peripheral surface of the through hole 6c. Therefore, in this embodiment, the through hole 6 is inserted after the round steel rod 7 is inserted.
Cement milk 8 is poured into c to fill the above gap,
By solidifying the cement milk, the reinforcing plates 4 and 5 are connected more firmly.

Furthermore, the inside diameter of the reinforcing cylinder 3 assembled in this way is also somewhat larger than the cross-sectional size of the pier 1, and even between the inner peripheral surface of the reinforcing cylinder 3 and the outer peripheral surface of the pier 1. Since there is a gap, the mortar 9 is poured into the gap to close the gap and to give a strong stickiness.

In this way, since the reinforcement work of the bridge pier 1 can be carried out without welding at the site, it is possible to uniformly reinforce each pier 1 without worrying about the decrease in strength due to the influence of wind and rain unlike welding. it can. Moreover, since a large-scale scaffold unlike the case of welding is not required, it is effective in shortening the construction period and the construction cost. Further, as described above, the coating of the reinforcing cylinder 3 can be completed at the factory, which is effective in shortening the construction period.

In the above embodiment, the reinforcing plates 4 and 5 are separately formed so that the circumferential position of the connecting portion 6b faces the center of the side surface of the pier 1, but is shown in FIGS. As shown, the reinforcing plates 4'and 5'may be formed separately so that the circumferential position of the connecting portion 6b 'faces the corner of the pier 1.

In this case, as shown in FIG. 5, the joints 6 ', 6'after connection are L-shaped in a plan view.
Although it is different from the previous embodiment in the shape of a letter, the connection method itself is the same, so a detailed description is omitted here.

By the way, it is not always necessary to reinforce the entire pier 1 with one reinforcing tube 3, and as shown in FIG. 1, by providing one reinforcing tube 3 for each suitable height dimension of the pier 1, The construction can be facilitated. As a construction procedure in this case, it is general to first attach the lower reinforcing cylinder 3 and then the upper reinforcing cylinder 3, but the bridge girder 2 interferes with the joint 6 of the upper reinforcing cylinder 3. In some cases, the round steel rod 7 cannot be inserted from above. Therefore, the round steel rod 7 is inserted from the lower side. However, when the joints 6 and 6 of the two reinforcing cylinders 3 and 3 are arranged at the same circumferential position, the joint of the lower reinforcing cylinder 3 is arranged. 6 may get in the way.

Therefore, in the present embodiment, the circumferential positions of the joints 6 and 6 of the two adjacent reinforcing cylinders 3 and 3 in the vertical direction are displaced from each other in this way, and the joints 6 and 6 of the upper reinforcing cylinder 3 are arranged.
The insertion work from the lower side of the round steel rod 7 into the above can be performed smoothly. Of course, even when the round steel rod 7 is inserted into the joint 6 of the lower reinforcing cylinder 3 from the upper side after the upper reinforcing cylinder 3 is attached, the upper joint 6 does not get in the way.

Here, as a method of shifting the circumferential positions of the joints 6 and 6, for example, the joint 6 of one of the reinforcing cylinders 3 faces the left and right (upper and lower in FIG. 2) side surfaces of the pier 1 as shown in FIG. 5 is shown in FIG. 5, the method of arranging the joint 6 of the other reinforcing cylinder 3 so as to face the front and rear (left and right in FIG. 2) side surfaces of the pier 1 and the joint 6 of one reinforcing cylinder 3 are shown in FIG. As described above, if the bridge pier 1 is located on one diagonal of the set, a method of locating the joint 6 of the other reinforcing cylinder 3 on another diagonal of the pier 1 may be used.

It should be noted that the shapes of the joints and the rod-shaped members in the above-mentioned embodiment are not limited to the present invention, and the shapes are not limited as long as they have the same function. For example, in the above-described embodiment, the plurality of connecting portions 6b are connected to one body portion 6a.
Although the joint 6 attached to and integrated with the above is used, a joint formed separately for each connecting portion may be used in the present invention.

Further, the present invention is not only applied as a reinforcing structure for viaducts of viaducts, but can be applied as a reinforcing structure for various columnar bodies.

[0030]

As described above, in the present invention, the joints provided at the side end portions of each reinforcing plate are combined so as to be staggered in the vertical direction, and then the rod-shaped member is inserted so as to penetrate these joints. It is designed to be inserted to connect the reinforcing plates. Therefore, according to the present invention, the welding work for attaching the joint to the reinforcing plate is performed in the factory, and then the reinforcing plate is assembled into a tubular shape on site and the rod-shaped member is inserted into the joint to perform the reinforcing work. Can be completed. Therefore, it is possible to secure the connecting strength between the reinforcing plates without concern that the welding strength will be reduced due to the influence of wind and rain unlike the mounting method by field welding.

Further, since it is possible to eliminate the need to form a large-scaled scaffold as in the case of welding, it is extremely effective in shortening the construction period and the construction cost.

If the cement is filled in the gap formed between the through hole and the rod-shaped member after the rod-shaped member is inserted, the reinforcing plates can be connected more firmly.

Further, when a plurality of reinforcing cylinders are arranged in the vertical direction of the columnar body, if the circumferential positions of the joints in these reinforcing cylinders are made different from each other, the joints in other reinforcing cylinders interfere with the insertion work of the rod-shaped member. It is possible to prevent it from becoming a trouble and to smoothly perform the reinforcement work.

Further, if the wall thickness of the joint is equal to or larger than the wall thickness of the reinforcing plate, it is possible to prevent the joint strength from being lowered due to the shape of the joint.

If the piers are reinforced by using the column reinforcing structure as described above, it is possible to form a high bridge having a high seismic resistance which is not affected by the quality of welding of the reinforcing plate, etc., with a short construction period and a low construction cost. it can.

[Brief description of the drawings]

FIG. 1 is a side view and a front view of a viaduct using a column reinforcing structure according to the present invention.

FIG. 2 is a cross-sectional plan view of the column reinforcing structure.

FIG. 3 is a plan view of a joint of the column reinforcing structure.

FIG. 4 is a side view of the joint.

FIG. 5 is a cross-sectional plan view of a second embodiment of a column reinforcing structure of the present invention.

FIG. 6 is a plan view of a joint of the second column reinforcing structure.

FIG. 7 is a side view of a joint of the second column reinforcing structure.

[Explanation of symbols]

 1 Bridge pier 2 Bridge girder 3 Reinforcement cylinder 4,5 Reinforcement plate 6 Joint 6c Through hole 7 Round steel rod

Claims (7)

[Claims] 1. A column reinforcing structure in which a plurality of reinforcing plates are combined in a tubular shape and wound around the outer periphery of a columnar body, wherein a joint that is alternately combined with the other side in the vertical direction is provided at a side end portion of each of the reinforcing plates. A column-reinforcing structure characterized in that a rod-shaped member is inserted through both joints to connect the reinforcing plates. 2. The column reinforcing structure according to claim 1, wherein cement is filled between the inner circumference of the joint and the outer circumference of the rod-shaped member. 3. The column reinforcing structure according to claim 1, wherein the column reinforcing member is attached to a prismatic columnar body, and the joint is positioned so as to face a side surface of the columnar body. 4. The column reinforcing structure according to claim 1, wherein the column reinforcing member is attached to a prismatic columnar body, and the joint is located so as to face a corner portion of the columnar body. 5. A plurality of reinforcing cylinders formed by combining the plurality of reinforcing plates into a cylindrical shape are arranged in the vertical direction of the columnar body, and the circumferential positions of the joints in the upper and lower reinforcing cylinders are different from each other. The column reinforcing structure according to any one of claims 1 to 4. 6. The column reinforcing structure according to claim 1, wherein a wall thickness of the joint is not less than a wall thickness of the reinforcing plate. 7. A viaduct comprising the column reinforcing structure according to claim 1 on a pier.