JP4232508B2 - Connecting structure of pier and girder - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a structure in which a steel concrete concrete pier and a steel girder supported on the pier are integrated and coupled.
[0002]
[Prior art]
Conventionally, in a connecting structure of a bridge pier such as a road bridge and a girder, a reinforced concrete pier is constructed, a steel girder is supported on the pier, and the pier and the girder are coupled to each other (for example, (See Patent Document 1).
An example of a conventional coupling structure between a pier and a girder will be described with reference to FIGS. As shown in FIG. 8, a reinforced concrete pier 10 supports a steel girder 4 thereon, and a road 2 is formed on the girder 4. Inside the pier 10, an assembly of main reinforcing bars 12, which are reinforcing bars, is arranged in the vertical direction, and the reinforcing bars forming the shear reinforcement bars 14 are spaced around the aggregate over the entire length of the main reinforcing bar 12 assembly. (See FIG. 9). In addition, in FIG. 8, illustration of the shear reinforcement 14 is abbreviate | 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 protrude upward from the upper end of the primary construction concrete 22. 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-shaped steel girder extending in the traveling direction of the road 2, and the horizontal girder 4S is an I-shaped steel girder stretched between the main girder 4M. The main beam 4M and the horizontal beam 4S intersect with each other to form a beam set. The upper part of the projecting portion 13 is inserted between the girder composed of the horizontal girder 4S and the main girder 4M.
[0004]
The assembly of the main bars 12 on the upper part of the protruding portion 13 faces the cross beam 4S, and a part of the main beam 4M is sandwiched between the sets of the main bars 12 of the protruding portion 13. The concrete 24 for the secondary construction is filled above the concrete 22 for the primary construction of the pier 10, and the protruding portion 13 is buried in the concrete 24 for the secondary construction. The concrete 24 for secondary construction is also filled between the cross beams 4S facing the portion 13. Therefore, a part of the main beam 4M sandwiched between the main bars 12 of the protruding portion 13 is also buried in the concrete 24 for secondary construction.
[0005]
In addition, a large number of stud dowels 26 are planted on the surface of the abdominal plate 8S of the cross beam 4S in contact with the filled concrete 24 for secondary construction. The stud gibber 26 is a bowl-shaped member, and its head portion protrudes from the surface of the abdominal plate 8S, and this protruding head portion is buried in the concrete 24 for secondary construction. Similarly, a stud gibber 26 is also planted on the surface of the main girder 4M sandwiched between the main bars 12 of the protruding portion 13 and buried in the concrete 24 for secondary construction.
The portion of the pier 10 filled with the secondary construction concrete 24 and the portion of the main girder 4M and the lateral 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 girder 4.
[0006]
[Patent Document 1]
Japanese Patent Laid-Open No. 4-92007 (pages 1 to 4 and FIGS. 1 to 15)
[0007]
[Problems to be solved by the invention]
However, in the conventional coupling structure of the pier 10 and the girder 4, it is necessary to closely arrange the shear reinforcement bars 14 in order to secure the bending strength of the pier 10, and the stud gibber 26 is formed in the rigid connection portion 34. There was a problem that a large number of locations where the main reinforcement 12 and the shear reinforcement 14 interfere with each other. That is, when the distance between the main muscle 12 and the shear reinforcement 14 in the rigid connection portion 34 and the abdominal plate 8S of the cross beam 4S opposed to the main reinforcement 12 and the shear reinforcement 14 is short, the head portion of the stud gibber 26 becomes the main muscle 12 and the shear reinforcement 14. Contact point and cause interference. If there is such an interference location, the main bar 12 and the shear reinforcement bar 14 will be disturbed. Further, it may be necessary to pass the main bar 12 through the lower flange of the girder 4. Therefore, in order to reduce these interference locations, it is necessary to change the bar arrangement state of the main reinforcement 12 and the shear reinforcement 14 in the rigid connection portion 34, and the work is complicated.
[0008]
In addition, when there are many interference points between the stud gibber 26 and the main reinforcement 12 and the shear reinforcement 14, it becomes difficult to fill the rigid joint 34 with the concrete 24 for secondary construction. For this reason, there were also problems in construction such as requiring complicated formwork installation work.
Further, the girder 4 and the main reinforcement 12 and the shear reinforcement 14 of the bridge pier 10 are connected to each other via the secondary construction concrete 24 in the rigid connection portion 34. However, the height of the main girder 4M and the horizontal girder 4S is high. If it is low, the length in the vertical direction (fixing length L) of the portion of the rigid coupling portion 34 that connects the cross beam 4S and the pier 10 will be short. If the fixing length L cannot be made sufficiently large, there is a problem in that the connection between the beam 4 and the pier 10 must be reinforced using means such as a joint.
[0009]
In addition, since the connection between the bridge pier 10 and the girder 4 in the rigid connection portion 34 is performed through the concrete 24 for secondary construction, in case the connection surface between the pier 10 and the girder 4 is opened. It is also necessary to take anticorrosion measures on 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 prior art, and the object of the present invention is to firmly connect the beam and the bridge pier, construct the bridge pier, and connect the beam to the beam. The construction work can be improved by simplifying the bar arrangement work required at the time, and providing a coupling structure between the pier and the girder that can secure a strong coupling 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 adopts the following configuration in order to solve the problem. That is, the present invention is a connecting structure of a steel concrete concrete pier and a steel girder supported on the pier, and connects the upper end of the steel frame protruding from the upper part of the pier and the girder, This is a coupling structure of a bridge pier and a girder filled with a hardening material between the protruding portion and the girder.
[0011]
According to the present invention, the pier and the girder are coupled by the coupling between the upper end portion of the steel frame of the projecting portion of the pier and the girder and the coupling between the projecting portion and the girder via the hardening material. Since the steel frame and the girder are connected, the reinforcing bar as the main reinforcing bar is unnecessary. Therefore, it is possible to omit reinforcing bars in the rigid connection portion, and the work of filling the hardening material between the protruding portions and the girders becomes easy. Moreover, even when the height of the girder is low, since the steel frame and the girder are coupled, it is possible to prevent the fixing length L between the pier and the girder from being insufficient and the coupling between the pier and the girder from becoming weak. .
[0012]
At this time , it is preferable that the upper end portion of the steel frame and the lower surface of the beam are coupled using at least one of welding and fasteners .
Is performed by at least one means of the coupling between the upper portion and the digit of steel bridge legs and welding the fastener, steel is strongly coupled with the digit, piers integrated with digits. In addition, as a fastener, a volt | bolt, a nut, etc. can be mentioned, for example.
[0013]
Furthermore, may the steel and shape steel.
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. Examples of the shape steel include H-shape steel, angle steel, groove-shape steel, T-shape steel, and I-shape steel.
[0014]
Furthermore, the steel may be a steel pipe.
Steel piers of steel pipe is formed, piers bending strength is ensured, thereby improving the strength of the pier.
Moreover, it is good to couple | bond the upper end part of the said steel frame, and the said girder via the steel plate couple | bonded with the said girder.
[0015]
Steel bridge leg combines with steel below the digits, this steel sheet is combined with digits, bridge piers and columns are firmly integrated. Further, since the steel frame is coupled to the girder via the steel plate, the girder and the steel frame can be coupled even when the upper end portion of the steel frame is not directly below the girder.
[0016]
DETAILED DESCRIPTION OF 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. 1 is a side view of the bridge according to the present embodiment, FIG. 2 is a longitudinal sectional view taken along line AA of FIG. 1, FIG. 3 is a front view of the pier according to the present embodiment, and FIG. FIG. 5 is a cross-sectional view taken along the line C-C of FIG. 3, and FIG. 6 is a configuration diagram of a connecting portion of the steel frame and the girder according to the present embodiment. 3 and 5, the 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 is formed of a pier 10, a girder 4, and a road 2. On the bridge pier 10, a girder 4 made up of a main girder 4M made of I-shaped steel and a cross girder 4S made of I-shaped steel is assembled, and the road 2 is placed on the girder 4.
As shown in FIGS. 3 and 4, the pier 10 is a columnar structure made of steel reinforced concrete having a rectangular horizontal cross section, and internally includes 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 assembly made up of a plurality of steel frames 16 is disposed in the circumferential direction of the pier 10 so as to form a horizontal cross-section of the mouth shape. In addition, a shear reinforcement bar 14 is wound around the aggregate of the steel frames 16, and a plurality of the shear reinforcement bars 14 are arranged at a substantially uniform interval from the lower part to the upper part of the steel frame 16. Furthermore, 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]
3 and 6, an adjustment member 20 for adjusting the height and the horizontal position is connected on the upper end portion 18A of the steel frame 16, and the length of the steel frame 16 is upward. Has been extended. On the upper end portion 18B of the adjusting member 20, a joint member 21 is further connected, and the length of the steel frame 16 is extended upward. The upper end portion of the joint member 21 forms an uppermost end portion 18C of the extended steel frame 16, and the uppermost end portion 18C is connected to a lower surface of a top plate 32 described later. The adjusting member 20 and the joint member 21 are the same H-shaped steel as the steel frame 16. The connecting portion between the upper end portion 18A of the steel frame 16 and the adjustment member 20 is secured to the steel joining plate 36 spanned between the steel frame 16 and the adjustment member 20 using a high-strength bolt 30 and a nut. ing. Further, the upper end portion 18 </ b> B of the adjustment member 20 and the joint member 21 are connected in the same manner as between the steel frame 16 and the adjustment member 20.
[0020]
The concrete filled in the pier 10 to a height slightly below the upper end portion 18 </ b> A 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 reinforcement 14 on the upper side from the upper end of the concrete 22 for primary construction protrude upward, and the protrusion part 13 is formed.
Further, as shown in FIG. 6, steel top plates 32 are attached to the top end portions 18 </ b> C of the steel frames 16 by welding, and the steel bottom plates 28 are mounted on these top plates 32. There is. Each top plate 32 is fastened to the bottom surface of the bottom plate 28 by welding or fastening means using high-strength bolts 30, and each steel frame 16, top plate 32 and bottom plate 28 are integrated.
[0021]
Further, as shown in FIG. 3, on the steel frame 16 forming the upper and lower sides of the steel frame 16 having a mouth shape in FIG. 4, the lower side of each of the cross beams 4Sa and 4Sb is provided via the bottom plate 28. The lower surface of the flange 6SL is placed. As shown in FIG. 3, the main girders 4Ma and 4Mb are located on the outer upper side of the steel frame 16 forming the left and right sides of the steel frame 16 having a square shape in FIG. 4. The lower flanges 6ML of the main girders 4Ma and 4Mb are located at a lower level than the bottom plate 28 and are lower than the lower flanges 6SL of the horizontal girders 4Sa and 4Sb. The upper flanges 6MU of the main girders 4Ma and 4Mb are positioned higher than the upper flanges 6SU of the horizontal girders 4Sa and 4Sb. And the protrusion part 13 of the bridge pier 10 is pinched | interposed between main girders 4Ma and 4Mb.
[0022]
Further, the edge of the bottom plate 28 extends to the main girders 4Ma and 4Mb and the horizontal girders 4Sa and 4Sb. The edges of the bottom plate 28 are coupled to the abdominal plates 8M of the main girders 4Ma, 4Mb by fastening means using welding and high-strength bolts, and the lower surfaces of the lower flanges 6SL of the horizontal girders 4Sa, 4Sb. They are connected by welding and fastening means using high-strength bolts.
[0023]
As shown in FIG. 5, two partition walls 5a and 5b made of I-shaped steel are formed in a well beam surrounded by main beams 4Ma and 4Mb and horizontal beams 4Sa and 4Sb. The lower flanges 6WL of the partition walls 5a and 5b are placed on the joint member 21 at the upper end of the steel frame 16 forming the left and right sides of the steel frame 16 having a mouth shape in FIG. It is listed. The lower flanges 6WL, the bottom plate 28, and the joint member 21 of the partition walls 5a and 5b are joined by welding or fastening means using high-strength bolts. Further, the partition walls 5a and 5b and the cross beams 4Sa and 4Sb are coupled by fastening means using welding or high-strength bolts.
[0024]
Moreover, as shown in FIG.3 and FIG.5, the part from the upper end of the concrete 22 for primary construction of the pier 10 to the baseplate 28 is filled with the concrete 24 for secondary construction which is a hardening material. Further, the portion surrounded by the main girders 4Ma and 4Mb and the horizontal girders 4Sa and 4Sb from the bottom plate 28 is also filled with the secondary construction concrete 24, and all the reinforcing bars of the protruding portion 13 are in the secondary construction concrete 24. And the partition walls 5a and 5b are also buried in the concrete 24 for secondary construction.
[0025]
A 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 the operation thereof will be described next.
The bridge pier 10 has steel frames 16 on the inner side, and these steel frames 16 support the strength of the bridge pier 10, so that the main bars are unnecessary. Since there is no main reinforcement, the reinforcement work when constructing the pier 10 is simplified.
[0026]
Further, since the adjusting member 20 and the joint member 21 are 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 primary construction is placed on the pier 10 Even if there is an error in the height position of the upper end portion 18 </ b> A of the steel frame 16, this error can be adjusted by the adjusting member 20 and the joint member 21.
[0027]
Further, the uppermost end portion 18C of the steel frame 16 extended by the adjusting member 20 and the joint member 21 is coupled to the lower surface of the bottom plate 28, and the bottom plate 28 is composed of the main girders 4Ma and 4Mb and the cross girders 4Sa and 4Sb, and the partition walls 5a and 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. The cross-sectional force such as a bending moment is transmitted from the girder 4 via the steel frame 16. Directly transmitted to the pier 10. Therefore, the number of shear reinforcement bars 14 can be reduced. For this reason, in the protrusion part 13, the number of the shear reinforcement bars 14 arranged around the aggregate of the main bars 12 can be reduced, and the number of the main bars 12 can also be reduced as described above. The amount of bar arrangement at 13 is reduced, and the space between the main reinforcement 12 and the shear reinforcement 14 can be increased. For this reason, even when the stud gibber, which is a saddle member, is implanted on each abdominal plate 8M of the main girders 4Ma, 4Mb, the number of locations where the stud diver interferes with the shear reinforcement 14 is reduced. .
[0028]
Further, since the concrete 24 for the secondary construction is placed in a portion surrounded by the main girders 4Ma and 4Mb and the horizontal girders 4Sa and 4Sb above the bottom plate 28, the bottom plate 28, the main girders 4Ma and 4Mb, and the cross girders 4Sa. 4Sb serves as a formwork for the concrete 24 for secondary construction. Therefore, the work for filling the concrete for secondary construction 24 becomes simple, and the workability when filling the concrete for secondary construction 24 is improved.
[0029]
In addition, the partition walls 5a and 5b buried in the concrete for secondary construction 24 form a skeleton in the concrete for secondary construction 24, and the strength of the concrete for secondary construction 24 is improved. The rigidity of the joint portion is also improved.
Even if the longitudinal length of the main girder 4M and the horizontal girder 4S is short, the main girder 4M and the horizontal girder 4S are directly connected to the steel frame 16, so there is no problem in connection. Although the fixing length L between the steel frame 16 of the projecting portion 13 through the secondary construction concrete 24 and the main beams 4Ma, 4Mb and the horizontal beams 4Sa, 4Sb is shortened, the steel frame 16 is connected to the beam 4 via the bottom plate 28. Are combined. Therefore, it is not necessary to compensate for the short fixing length L between the beam 4 and the pier 10 by using a means such as a joint.
[0030]
Further, in this embodiment, the pier 10 has a rectangular cross section and the steel frame 16 is made of H-shaped steel. Instead, the pier 10 may be configured as shown in the modified example of FIG. That is, the steel frame is formed by the circular steel pipe 38, the aggregate of the main reinforcing bars 12 is arranged along the inner periphery of the circular steel pipe 38, and the primary construction concrete 22 is filled inside the circular steel pipe 38 to constitute the pier 10. . By making the circular steel pipe 38 into a steel frame, the concrete 22 for primary construction into the pier 10 can be filled without using a formwork.
[0031]
Further, in the present embodiment, the steel frame 16 is made of H-shaped steel, but it goes without saying that the steel frame 16 can be made of angle steel, groove-shaped steel, T-shaped steel, I-shaped steel or the like instead of the H-shaped steel. .
Further, in the present embodiment, the steel frame 16 is coupled to the girder 4 via the top plate 32 and the bottom plate 28. However, the coupling described below is also possible. That is, each steel frame 16 is arranged immediately 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 upper end portion 18B of each extended steel frame 16 is placed. Is directly coupled to any of the main girders 4Ma, 4Mb and the transverse girders 4Sa, 4Sb directly above by welding. Even by such a connection between the steel frame 16 and the girder 4, the pier 10 and the girder 4 can be firmly coupled and integrated.
[0032]
【The invention's effect】
Since the present invention has the above-described structure of the bridge pier and the girder, the girder and the pier can be firmly coupled, and the reinforcement work required when constructing the pier and coupling with the girder is simplified. Thus, it is possible to improve the workability, and it is possible to provide a coupling structure between the pier and the girder that can secure a strong coupling 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 the present embodiment.
2 is a longitudinal sectional view taken along line AA in FIG.
FIG. 3 is a front view of a pier according to the present embodiment.
4 is a cross-sectional view taken along line BB in FIG. 3. FIG.
FIG. 5 is a cross-sectional view taken along the line CC of FIG. 3, and is a view in which illustration of a part of concrete for secondary construction and illustration of a part of the bottom plate are omitted.
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 connecting portion between a bridge pier and a girder.
FIG. 9 is a configuration diagram of main bars and shear reinforcement bars of a conventional pier.
[Explanation of symbols]
1 Bridge 2 Road 4 Girder 4M, 4Ma, 4Mb Main girder 4S, 4Sa, 4Sb Cross girder 5a, 5b Bulkhead 6ML Lower girder 6MU of main girder Upper flange 6SU of main girder Upper flange 6SL of girder Lower flange 6WL of girder Bulkhead Lower Flange 8M Main Girder Abdominal Plate 8S Horizontal Girder Abdominal Plate 10 Bridge Pier 12 Main Reinforcement 13 Reinforcing Bar Projection 14 Shear Reinforcement 16 Steel Frame 18A Steel Upper End 18B Adjustment Member Upper End 18C Adjustment Member and Joint Upper end 20 of steel frame extended by member 21 Adjustment member 21 Joint member 22 Primary construction concrete 24 Secondary construction concrete 26 Stud gibber 28 Bottom plate 30 High strength bolt 32 Top plate 34 Rigid joint 38 Round steel pipe L Fixation Long

Claims (2)

A structure comprising a steel reinforced concrete pier having a plurality of steel frames extending vertically and a steel girder supported on the pier,
Bonding the upper ends of a plurality of steel frames protruding from the upper part of the pier to the same bottom plate, joining the bottom plate to the beam,
A coupling structure of a bridge pier and a girder, wherein a hardening material is filled between the protruding portion and the girder. A steel girder consists of a main girder and a horizontal girder spanned between the main girder.
With coupling the upper surface of the bottom plate to the crossbeam, the coupling structure of the pier and column according to claim 1, characterized in that the coupling edges of the bottom plate to the main girder.

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