JP2004300698A - Joint structural of pier and girder - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a joint structure of a pier and a girder capable of firmly connecting between the pier and the girder, increasing workability by simplifying bar arrangement work in the case the pier is constructed and ensuring firm connection between the pier and the girder without depending on the height of the girder. <P>SOLUTION: The joint structure is so constituted that the upper end section of a steel frame 16 of the steel framed concrete construction pier 10 and main girders 4Ma and 4Mb and horizontal girders 4Sa and 4Sb are connected with welding and clamped tools through a bottom plate 28. The joint structure is so constituted that concrete 24 is filled among a projected part 13 of the steel frame 16 projected from the upper part of the pier 10, the main girders 4Ma and 4Mb and the horizontal girders 4Sa and 4Sb. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a structure in which a steel concrete pier and a steel girder supported on the pier are integrated and connected.
[0002]
[Prior art]
Conventionally, in a joint structure between a pier and a girder such as a road bridge, a reinforced concrete pier is constructed, a steel girder is supported on the pier, and the pier and the girder are connected to each other (for example, See Patent Document 1).
An example of a conventional connection structure between a pier and a girder will be described with reference to FIGS. As shown in FIG. 8, a pier 10 made of reinforced concrete supports a steel girder 4 thereon, and a road 2 is formed on the girder 4. Inside the pier 10, an aggregate of main reinforcing bars 12 as reinforcing bars is arranged in a vertical direction, and the reinforcing bars 14 forming the shear reinforcing bars 14 are spaced around the aggregate over the entire length of the aggregate of the main reinforcing bars 12. (See FIG. 9). In FIG. 8, the illustration of the shear reinforcing bars 14 is omitted.
[0003]
The pier 10 is filled with concrete 22 for primary construction from the lower end to a height slightly lower than the lower end of the girder 4, and the main reinforcement 12 and the shear reinforcement 14 project upward from the upper end of the concrete 22 for primary construction. Thus, the protruding portion 13 of the reinforcing bar is formed.
The girder 4 is composed of a main girder 4M and a horizontal girder 4S. The main girder 4M is an I-beam girder extending in the traveling direction of the road 2. The horizontal girder 4S is an I-girder girder stretched between the main girder 4M. The main girder 4M and the horizontal girder 4S intersect with each other to form a girder set. The upper part of the protruding portion 13 enters between the girder set consisting of the horizontal girder 4S and the main girder 4M.
[0004]
The aggregate of the main bars 12 on the upper portion of the protruding portion 13 faces the cross beam 4S, and a part of the main beam 4M is sandwiched between the aggregate of the main bars 12 of the protruding portion 13. The concrete for secondary construction 24 is filled above the concrete for primary construction 22 of the pier 10, and the projecting portion 13 is buried in the concrete 24 for secondary construction, and the projecting portion 13 and the projecting portion The space between the cross beam 4S facing the portion 13 and the secondary work concrete 24 is also filled. Therefore, a part of the main girder 4M sandwiched between the main bars 12 of the protruding portion 13 is also buried in the concrete for secondary construction 24.
[0005]
Furthermore, a large number of stud dowels 26 are planted on the surface of the web 8S of the cross beam 4S that is in contact with the filled concrete 24 for secondary construction. The stud dowel 26 is a stud-like member, the head of which protrudes from the surface of the abdominal plate 8S, and the protruding head is buried in the concrete 24 for secondary construction. Further, a stud dowel 26 is similarly planted on the surface of the main girder 4M which is buried in the concrete 24 for secondary construction sandwiched between the main bars 12 of the protruding portion 13.
Then, the portion of the pier 10 filled with the secondary construction concrete 24 and the portions of the main girder 4M and the horizontal girder 4S that are in contact with the secondary construction concrete 24 form a rigid connection portion 34. A connecting portion 34 connects the pier 10 and the spar 4.
[0006]
[Patent Document 1]
JP-A-4-92007 (Pages 1 to 4, FIGS. 1 to 15)
[0007]
[Problems to be solved by the invention]
However, in the conventional connection structure between the pier 10 and the spar 4, it is necessary to arrange the shear reinforcing bars 14 densely in order to secure the bending strength of the pier 10. There is a problem that a large number of portions that interfere with the main reinforcement 12 and the shear reinforcement 14 are generated. That is, if the distance between the main reinforcing bar 12 and the shear reinforcing bar 14 in the rigid connection portion 34 and the opposing abdominal plate 8S of the cross beam 4S is short, the head portion of the stud dowel 26 becomes the main bar 12 and the shear reinforcing bar 14. , Causing interference. If there is such an interference portion, the arrangement of the main reinforcing bars 12 and the shear reinforcing bars 14 is hindered. In some cases, it is necessary to penetrate the main reinforcement 12 through the lower flange of the spar 4. Therefore, in order to reduce these interference points, the arrangement of the main reinforcement 12 and the shear reinforcement 14 in the rigid connection portion 34 must be changed, and the operation is complicated.
[0008]
In addition, if there are many interference locations between the stud dowel 26, the main reinforcing bar 12, and the shear reinforcing bars 14, it becomes difficult to fill the rigid connection portion 34 with the concrete 24 for secondary construction. For this reason, there was also a problem in construction such as a complicated form setting work was required.
Further, the girder 4 and the main reinforcement 12 and the shear reinforcement 14 of the pier 10 are connected to each other via the secondary construction concrete 24 in the rigid connection portion 34, but the height of the main girder 4M and the horizontal girder 4S is reduced. If the length is low, the length in the vertical direction (fixing length L) of the rigid connection portion 34 connecting the cross beam 4S and the pier 10 will be short. If the fixing length L cannot be made sufficiently large, there is also a problem that the connection between the spar 4 and the pier 10 must be reinforced by means such as a joint.
[0009]
In addition, since the connection between the pier 10 and the girder 4 at the rigid connection portion 34 is performed through the secondary working concrete 24, the connection surface between the pier 10 and the girder 4 is opened in case of opening. It was necessary to take anticorrosion measures for the main reinforcement 12 and the shear reinforcement 14.
The present invention has been made in order to eliminate the above-mentioned problems of the conventional technology, and an object of the present invention is to enable a firm connection between a girder and a pier, construct a pier, and connect the girder. Provide a pier-to-girder joint structure that can simplify the necessary reinforcing work and improve workability, and secure a strong connection between the pier and the girder even when the girder height is low. It is to be.
[0010]
[Means for Solving the Problems]
The present invention has the following configuration to solve the problem. The invention according to claim 1 is a joint structure between a steel concrete pier and a steel girder supported on the pier, wherein an upper end portion of a steel frame protruding from an upper portion of the pier and the girder are joined. In addition, a bridge pier and a girder are filled with a hardening material between the protruding portion and the girder.
[0011]
According to the invention of claim 1, the pier and the girder are connected by the connection between the upper end portion of the steel frame and the girder of the protruding portion of the pier and the connection between the protruding portion and the girder via the hardening material. ing. Since the steel frame and the girder are joined, the reinforcing bar as the main bar is unnecessary. Therefore, it is possible to omit the arrangement of the reinforcing bars in the rigid connection portion, and the work of filling the hardening material between the projecting portion and the girder becomes easy. Also, even when the height of the girder is low, since the steel frame is connected to the girder, it is possible to prevent the anchorage length L between the pier and the girder from being insufficient and the connection between the pier and the girder to be weakened. .
[0012]
According to a second aspect of the present invention, there is provided the joint structure between the pier and the girder according to the first aspect, wherein an upper end portion of the steel frame and a lower surface of the girder are welded and / or fastened by a fastener. It is a joint structure between a pier and a girder that are joined by using.
According to the invention of claim 2, since the upper end of the steel frame of the pier and the girder are connected by at least one of welding and fasteners, the steel frame is firmly connected to the girder, and the pier is integrated with the girder. Become Note that examples of the fastener include a bolt and a nut.
[0013]
According to a third aspect of the present invention, there is provided a joint structure between the pier and the girder according to the first or second aspect, wherein the pier and the girder are formed of steel.
According to the third aspect of the present invention, since the steel frame of the pier is formed by the shape steel, the bending strength of the pier is secured, and the strength of the pier is improved. In addition, H-shaped steel, angle iron, grooved steel, T-shaped steel, I-shaped steel, etc. can be mentioned as a shape steel.
[0014]
According to a fourth aspect of the present invention, there is provided a joint structure between the pier and the spar according to the first or second aspect, wherein the pier and the spar are formed by using the steel frame as a steel pipe.
According to the invention of claim 4, the steel frame of the pier is formed by the steel pipe, the bending strength of the pier is secured, and the strength of the pier is improved.
According to a fifth aspect of the present invention, there is provided a connecting structure between the pier and the girder according to any one of the first to fourth aspects, wherein an upper end portion of the steel frame and the girder are connected via a steel plate connected to the girder. It is a connection structure between a pier and a girder.
[0015]
According to the invention of claim 5, the steel frame of the pier is joined to the steel plate below the girder, and since this steel plate is joined to the girder, the pier and the girder are firmly integrated. Further, since the steel frame is connected to the girder via the steel plate, the girder can be connected to the steel frame even when there is no upper end portion of the steel frame directly below the girder.
[0016]
BEST MODE FOR CARRYING OUT THE INVENTION
A first embodiment of the present invention will be described with reference to the drawings.
First, the configuration of the present embodiment will be described with reference to FIGS. FIG. 1 is a side view of a bridge according to the present embodiment, FIG. 2 is a vertical sectional view taken along line AA of FIG. 1, FIG. 3 is a front view of a pier according to the present embodiment, and FIG. FIG. 5 is a cross-sectional view taken along line BB of FIG. 3, FIG. 5 is a cross-sectional view taken along line CC of FIG. 3, and FIG. In FIG. 3 and FIG. 5, illustration of the concrete for primary construction or the concrete for secondary construction is partially omitted.
[0017]
As shown in FIGS. 1 and 2, the bridge 1 includes a pier 10, a girder 4, and a road 2. On the pier 10, a girder 4 composed of a main girder 4M made of I-shaped steel and a cross girder 4S made of I-shaped steel is mounted, and the road 2 is mounted on the girder 4.
As shown in FIGS. 3 and 4, the pier 10 is a columnar structure made of steel-framed reinforced concrete having a rectangular horizontal cross section, and includes therein a steel frame 16 made of H-shaped steel acting as a main reinforcing bar and a reinforcing bar forming a shear reinforcing bar 14. Have.
[0018]
In the pier 10, an aggregate composed of a plurality of steel frames 16 is disposed so as to form a square cross section in the circumferential direction of the pier 10. Further, a shear reinforcing bar 14 is wound around the aggregate of the steel frames 16, and a plurality of the shear reinforcing bars 14 are arranged at substantially uniform intervals from a lower portion to an upper portion of the steel frame 16. Further, the height of the upper end portion 18A of the steel frame 16 is slightly lower than the lower flange 6SL of the cross beam 4S.
[0019]
As shown in FIGS. 3 and 6, an adjusting member 20 for adjusting the height and the horizontal position is connected to the upper end portion 18A of the steel frame 16, and the length of the steel frame 16 is increased. Has been extended. A connection member 21 is further connected to the upper end portion 18B of the adjustment member 20, and the length of the steel frame 16 is extended upward. The upper end of the connection member 21 forms the uppermost end 18C of the elongated steel frame 16, and the uppermost end 18C is connected to the lower surface of a ceiling plate 32 described later. The adjustment member 20 and the connection member 21 are the same H-section steel as the steel frame 16. At the connecting portion between the upper end portion 18A of the steel frame 16 and the adjustment member 20, a steel joining plate 36 bridged between the steel frame 16 and the adjustment member 20 is stopped using a high-strength bolt 30 and a nut. ing. The connection between the upper end portion 18B of the adjustment member 20 and the connection member 21 is the same as that between the steel frame 16 and the adjustment member 20.
[0020]
The concrete filled in the pier 10 to a height slightly lower than the upper end portion 18A of the steel frame 16 is the concrete 22 for primary construction filled before the pier 10 and the girder 4 are joined. The steel frame 16 and the shear reinforcing bars 14 located above from the upper end of the concrete 22 for primary construction project upward to form the projecting portion 13.
Further, as shown in FIG. 6, a steel top plate 32 is attached by welding to the uppermost end portion 18C of each steel frame 16, and a steel bottom plate 28 is placed on these top plates 32. Is on. Each top plate 32 is fastened to the lower surface of the bottom plate 28 by welding or fastening means using a high-strength bolt 30, and each steel frame 16, the top plate 32 and the bottom plate 28 are integrated.
[0021]
As shown in FIG. 3, the lower sides of the cross beams 4Sa and 4Sb are placed on the steel frames 16 forming the upper and lower sides of the steel frames 16 forming the mouth shape in FIG. The lower surface of the flange 6SL rests. As shown in FIG. 3, the main girders 4Ma and 4Mb are located outside and above the steel frames 16 forming the left and right sides of the steel frames 16 forming the mouth shape in FIG. The lower flanges 6ML of the main girders 4Ma, 4Mb are located at a height lower than the bottom plate 28, and are lower than the lower flanges 6SL of the cross girders 4Sa, 4Sb. The upper flanges 6MU of the main girders 4Ma and 4Mb are located higher than the upper flanges 6SU of the horizontal girders 4Sa and 4Sb. The projecting portion 13 of the pier 10 is sandwiched between the main girders 4Ma and 4Mb.
[0022]
The edge of the bottom plate 28 extends to the main girders 4Ma and 4Mb and the horizontal girders 4Sa and 4Sb. And each edge of the bottom plate 28 is connected to each abdominal plate 8M of the main girder 4Ma, 4Mb by welding and fastening means using high-strength bolts, and also the lower surface of each lower flange 6SL of the horizontal girder 4Sa, 4Sb. They are connected by welding and fastening means using high-strength bolts.
[0023]
Further, as shown in FIG. 5, two partition walls 5a and 5b made of I-shaped steel are formed in a girder surrounded by the main girders 4Ma and 4Mb and the horizontal girders 4Sa and 4Sb. The lower flanges 6WL of the partition walls 5a and 5b are placed, via the bottom plate 28, on the connection member 21 at the upper end of the steel frame 16 forming the left and right sides of the steel frame 16 having the shape of a mouth in FIG. It is listed. The lower flanges 6WL of the partition walls 5a and 5b, the bottom plate 28, and the connection member 21 are connected by welding or fastening means using high-strength bolts. The partition walls 5a and 5b and the cross beams 4Sa and 4Sb are connected by welding or fastening means using high-strength bolts.
[0024]
As shown in FIGS. 3 and 5, the portion from the upper end to the bottom plate 28 of the primary construction concrete 22 of the pier 10 is filled with the secondary construction concrete 24 which is a hardening material. Further, the part surrounded by the main girders 4Ma, 4Mb and the horizontal girders 4Sa, 4Sb above the bottom plate 28 is also filled with the secondary working concrete 24, and all the reinforcing bars of the projecting portions 13 are in the secondary working concrete 24. And the partition walls 5a and 5b are also buried in the concrete 24 for secondary construction.
[0025]
The road 2 is formed on the upper flange 6MU of the main girder 4, and the main girder 4 supports the road 2.
This embodiment is configured as described above, and its operation will be described next.
The pier 10 has steel frames 16 on the inside, and since these steel frames 16 support the strength of the pier 10, the main reinforcement is not required. Since there is no main reinforcement, the reinforcement arrangement work when constructing the pier 10 is simplified.
[0026]
In addition, since the adjusting member 20 and the connection member 21 are present and connected between the upper end portion 18A of the steel frame 16 and the lower surface of the bottom plate 28, after the concrete 22 for the primary construction is cast on the pier 10, Even if there is an error in the height position of the upper end portion 18A of the steel frame 16, the error can be adjusted by the adjusting member 20 and the connection member 21.
[0027]
Further, the uppermost end 18C of the steel frame 16 extended by the adjusting member 20 and the connecting member 21 is connected to the lower surface of the bottom plate 28, and the bottom plate 28 is composed of the main girders 4Ma, 4Mb and the horizontal girders 4Sa, 4Sb, the partition walls 5a, 5b. The steel frame 16 has a structure directly connected to the main girders 4Ma, 4Mb, the horizontal girders 4Sa, 4Sb, and the partition walls 5a, 5b. It is transmitted directly to the pier 10. Therefore, it is possible to reduce the number of the shear reinforcing bars 14. Therefore, in the projecting portion 13, the number of the shear reinforcing bars 14 arranged around the aggregate of the main bars 12 can be reduced, and the number of the main bars 12 can be reduced as described above. The arrangement of the reinforcing bars at 13 decreases, and the space between the main bars 12 and the shear reinforcing bars 14 can be increased. For this reason, even when the stud dowel, which is a stud member, is implanted on each abdominal plate 8M of the main girder 4Ma, 4Mb, the number of locations where the stud dovetail interferes with the shear reinforcement 14 is reduced. .
[0028]
Moreover, since the concrete 24 for secondary construction is cast in the part surrounded by the main girder 4Ma, 4Mb and the horizontal girder 4Sa, 4Sb above the bottom plate 28, the bottom plate 28, the main girder 4Ma, 4Mb and the horizontal girder 4Sa. , 4Sb serves as a formwork for the concrete 24 for secondary construction. Therefore, the work for filling the secondary construction concrete 24 is simplified, and the workability at the time of filling the secondary construction concrete 24 is improved.
[0029]
In addition, the partition walls 5a and 5b buried in the secondary construction concrete 24 form a skeleton in the secondary construction concrete 24, and the strength of the secondary construction concrete 24 is improved. Also, the rigidity of the connecting portion is improved.
Further, even when the length of the main girder 4M and the horizontal girder 4S in the vertical direction is short, there is no problem in connection because the main girder 4M and the horizontal girder 4S are directly connected to the steel frame 16. The fixing length L between the steel frame 16 of the projecting portion 13 and the main girder 4Ma, 4Mb and the horizontal girder 4Sa, 4Sb via the secondary working concrete 24 is reduced, but the steel frame 16 is connected to the girder 4 via the bottom plate 28. Are combined. Therefore, it is not necessary to compensate for the shortness of the fixing length L between the spar 4 and the pier 10 using a joint or the like.
[0030]
Further, in the present embodiment, the pier 10 has a rectangular cross section, and the steel frame 16 is made of H-shaped steel. Alternatively, the pier 10 may have a structure as shown in a modification of FIG. 7. That is, a steel frame is formed by the circular steel pipe 38, an aggregate of the main reinforcing bars 12 is arranged along the inner periphery of the circular steel pipe 38, and the inside of the circular steel pipe 38 is filled with the concrete 22 for the primary construction, thereby forming the pier 10. . By using the circular steel pipe 38 as a steel frame, the concrete 22 for the primary construction can be filled into the pier 10 without using a formwork.
[0031]
Further, in the present embodiment, the steel frame 16 is made of the H-shaped steel. However, the steel frame 16 can be made of an angle steel, a grooved steel, a T-shaped steel, an I-shaped steel or the like instead of the H-shaped steel. .
In addition, in the present embodiment, the steel frame 16 is connected to the spar 4 via the top plate 32 and the bottom plate 28, but the connection described below is also possible. That is, each steel frame 16 is arranged directly below the main girders 4Ma, 4Mb and the horizontal girders 4Sa, 4Sb, the length of each steel frame 16 is adjusted by the height adjusting member 20, and the extended upper end portion 18B of each steel frame 16 is extended. Is directly connected to any of the main girders 4Ma and 4Mb and the horizontal girders 4Sa and 4Sb by welding. By such a connection between the steel frame 16 and the spar 4, the pier 10 and the spar 4 can be firmly connected and integrated.
[0032]
【The invention's effect】
Since the present invention has the joint structure between the pier and the girder as described above, the girder and the pier can be firmly joined to each other, and the reinforcing work required for constructing the pier and joining with the girder can be simplified. Therefore, there is an effect that it is possible to provide a joint structure between the pier and the girder which can secure a strong connection between the pier and the girder even when the height of the girder is low.
[Brief description of the drawings]
FIG. 1 is a side view of a bridge according to an embodiment.
FIG. 2 is a vertical sectional view taken along line AA of FIG.
FIG. 3 is a front view of the pier according to the present embodiment.
FIG. 4 is a cross-sectional view taken along the line BB of FIG. 3;
5 is a cross-sectional view taken along the line CC of FIG. 3 and omitting illustration of a part of concrete for secondary construction and illustration of a part of a bottom plate.
FIG. 6 is a configuration diagram of a joint portion between a steel frame and a girder according to the present embodiment.
FIG. 7 is a cross-sectional view of a pier according to a modification of the present embodiment.
FIG. 8 is a configuration diagram of a conventional joint portion between a pier and a girder.
FIG. 9 is a configuration diagram of a main reinforcing bar and a shear reinforcing bar of a conventional pier.
[Explanation of symbols]
1 bridge 2 road 4 girder 4M, 4Ma, 4Mb main girder 4S, 4Sa, 4Sb horizontal girder 5a, 5b partition 6ML main girder lower flange 6MU main girder upper flange 6SU horizontal girder lower flange 6SL horizontal girder lower flange 6WL Lower flange 8M of partition wall Abdominal plate 8S of main girder 8S Abdominal plate of horizontal girder 10 Bridge pier 12 Main reinforcing bar 13 Projecting portion of reinforcing bar 14 Shear reinforcing bar 16 Steel frame 18A Upper end portion 18B of steel frame Upper end portion 18C of adjusting member 18C Adjusting member and connection The top end 20 of the steel frame extended by the member 20 The adjusting member 21 The connection member 22 The concrete for primary construction 24 The concrete for secondary construction 26 Stud dowel 28 Bottom plate 30 High-strength bolt 32 Top plate 34 Rigid connection part 38 Round steel pipe L Anchoring Long

Claims (5)

A joint structure of a steel concrete pier and a steel girder supported on the pier,
Combine the upper end of the steel frame protruding from the pier upper part and the girder,
A joint structure between a pier and a girder, wherein a hardening material is filled between the projecting portion and the girder. 2. The joint structure between a pier and a girder according to claim 1, wherein an upper end of the steel frame and a lower surface of the girder are joined by using at least one of welding and fasteners. 3. The connection structure between the pier and the girder. The joint structure between the pier and the girder according to claim 1 or 2, wherein the steel frame is formed of a shaped steel. The joint structure between a pier and a girder according to claim 1 or 2, wherein the steel frame is a steel pipe. 5. The pier and the girder connecting structure according to claim 1, wherein an upper end of the steel frame and the girder are connected via a steel plate connected to the girder. 6. Combined structure with digits.

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