JP2004137686A - Composite panel structure, panel bridge structure and construction method for continuous composite girder bridge - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a composite panel structure of steel and concrete, having required rigidity and reduced in manufacturing cost, and a composite panel bridge and a construction method for a continuous composite girder bridge using a composite panel for reducing the term of work in a job site and simplifying the construction using the composite panel. <P>SOLUTION: In this composite panel, upper surfaces 13 of a plurality of stringers 3 disposed at intervals are fixed to the lower surface of a bottom steel plate 2, and a plurality of transverse ribs 4 disposed at intervals in the direction intersecting perpendicularly to the stringers 3 are fixed to the upper surface of the bottom steel plate 2, and the composite panel is filled with bed plate concrete 5 to bury the transverse ribs 4. The composite panel is supported on a cross beam by a shearing member projected in the axial direction of a bridge provided on upper ends of the stringers 3 as main girders and a splice plate, and the side of the cross beam and the end of the composite panel 1 are integrally connected by a bearing pressure plate 10 mounted on the lower end of the stringer 3, a connecting means mounted on the side of the cross beam and the end of the composite panel 1, and concrete filling the periphery to construct the continuous girder. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a steel / concrete composite panel structure integrating a floor slab and a stringer, which is applied to the construction or replacement of a road bridge, viaduct, pedestrian bridge, railway bridge, and the like, and a panel bridge structure using the composite panel, The present invention relates to a method of constructing a continuous composite girder bridge using composite panels.
[0002]
[Prior art]
Conventionally, precast concrete bridges such as a pretension type simple slab bridge (pretend slab bridge) and a simple T-girder bridge (pretend T-girder bridge) have been known for relatively small span road bridges and railway bridges. I have. As a steel bridge, there is an H-shaped steel bridge using a sheet girder or a main girder made of an H-shaped steel.
[0003]
These bridges are characterized in terms of structure, workability, maintainability, etc., but H-shaped steel bridges can be assembled on a main girder using standardized rolled H-shaped steel products. This is advantageous in that it is simple, the construction period can be shortened, and the weight can be reduced.
[0004]
Plate girder bridges and H-shaped steel bridges are composed of a main structure such as a main girder and a horizontal girder and a floor slab structure, and the floor slabs disposed on the main girder are reinforced concrete floor slabs or steel formwork to be constructed locally. There is a grating slab in which a reinforcing steel material is prefabricated.
[0005]
However, a conventional sheet girder bridge is composed of many main structural members, and the amount of processing is large, which causes an increase in cost. In addition, since the erection of the main structure is connected by high-strength bolts and welding on site using supports and scaffolds, special skills and quality control are required. It is common practice to check the shape after the completion of the erection process and then proceed to floor slab construction. In some cases, the features of steel bridges that can shorten the on-site construction period cannot be utilized. Particularly in the case of reinforced concrete slabs that require formwork, a considerable construction period is required. Grating slabs, composite slabs, steel slab girders, etc. are used when the need for shortening the construction period is large, such as when rebuilding a bridge or constructing an urban area.
[0006]
Recently, there have been proposed many composite floor slab bridges made of concrete and steel such as a shape steel or a truss.
[0007]
For example, one disclosed in Japanese Patent Application Laid-Open No. 11-166208 (Patent Document 1) discloses a method in which a steel plate upper surface plate and a lower surface plate are connected at predetermined intervals via inner ribs inside a floor slab steel shell. Concrete is filled to form a composite slab, and the composite slab is a bridge fastened to the upper surface of the girder assembly with fastening bolts. The girder set includes a main girder and a horizontal girder for preventing the main girder from falling sideways and buckling and dispersing the floor slab load to the vertical girder.
[0008]
Further, the bridge disclosed in Japanese Patent Application Laid-Open No. 2002-4221 (Patent Document 2) includes a reinforcing material (flat steel plate) arranged on a top surface of a bottom steel plate in a direction perpendicular to the bridge axis, between two main girders. The reinforcing material located has a convex curved shape (arch) facing upward, and a space is formed between the bottom steel plate and the reinforcing material so that cracks are hardly generated in the floor slab concrete. In this bridge, the main girder is also connected by horizontal girder.
[0009]
In a normal bridge, a composite slab manufactured separately from the main girder is mounted on the main girder, and there is a slab bridge using only the slab.
[0010]
A conventional example of a floor slab bridge is disclosed, for example, in Japanese Patent Application Laid-Open No. 9-221717 (Patent Document 3). This is to connect a steel panel in which a plurality of H-beams or CT-beams are joined on the bottom plate of a straight steel sheet pile and a side plate (frame) provided in the straight steel sheet pile with PC steel or the like, It was constructed by casting cast-in-place concrete.
[0011]
[Patent Document 1]
JP-A-11-166208
[Patent Document 2]
JP-A-2002-4221
[Patent Document 3]
JP-A-9-221717
[0012]
[Problems to be solved by the invention]
The sheet girder bridge in the prior art has many constituent members, and uses a support and a scaffold at the time of erection, so that the construction period is long and the cost is high. In addition, since the main girder made of H-shaped steel and the floor slab are separate from each other in the combination of the H-shaped steel bridge and the composite slab, the floor slab is installed after the main girder is erected between the abutments (or piers) at the time of construction. Two steps were required for installation.
[0013]
Further, the composite floor slab disclosed in Japanese Patent Application Laid-Open No. H11-166208 is designed to fill concrete in the steel shells of the upper steel plate and the lower steel plate. Since the composite slab needs to be fastened to the upper surface of the girder set consisting of the main girder and the horizontal girder with fastening bolts, three steps are required: main girder installation, horizontal girder joining, and composite slab fastening. There was also a problem that a work scaffold was required under the girder when assembling the cross girder.
[0014]
The composite floor slab disclosed in Japanese Patent Application Laid-Open No. 2002-4221 is limited to a structure using two main girders, and the horizontal girder is used to prevent the main girders from falling over sideways and dispersing the floor slab load. Since it is used and is separate from the main girder as in the case of the composite floor slab, there are problems that the number of construction steps is increased and that a work scaffold is required below the girder when assembling the cross girder.
[0015]
The floor slab bridge exemplified in JP-A-9-221717 has the advantage that the main girder is incorporated in the floor slab and integrated, so that the installation process is completed in one step. Due to its thickness and heavy weight, its use is limited to small bridges of about several meters or bridges that are limited by under-girder space.
[0016]
In addition, as a form of the bridge structure of multiple spans, it is more advantageous in terms of cost to use a continuous composite girder bridge in which the floor slab shares the main girder action. However, in the case of a continuous girder bridge, it is necessary to achieve continuity that exhibits high bonding strength at the bridge fulcrum and to prevent cracking of the slab concrete due to the negative bending moment. For this reason, in the prior art, a method of placing concrete at the fulcrum part in advance and curing (solidifying) the fulcrum part concrete, or a method of temporarily jacking up the fulcrum part main girder at the time of concrete placement. For example, there has been adopted a method of placing concrete in a slab in a continuous girder bridge using, a method of introducing a prestress above a main girder at a fulcrum, or a method of arranging a large number of reinforcing bars.
[0017]
The continuation means according to these conventional techniques has a problem that the construction period becomes long or that large-scale facilities need to be prepared, which leads to an increase in construction costs.
[0018]
The present invention provides a composite panel structure made of steel / concrete having required rigidity and reduced manufacturing cost, and a composite panel bridge and composite panel using the composite panel to shorten the on-site construction period and simplify the construction. It is an object of the present invention to provide a construction method of a continuous composite girder bridge used.
[0019]
[Means for Solving the Problems]
The gist of the configuration of the present invention is as follows.
According to the invention of claim 1, an upper surface of a plurality of stringers arranged at intervals on a lower surface of a bottom steel plate is fixed, and a plurality of horizontal ribs are spaced on the upper surface of the bottom steel plate in a direction orthogonal to the stringers. A composite panel structure fixedly disposed and filled with floor slab concrete so as to bury the lateral ribs.
[0020]
According to a second aspect of the present invention, the composite panel according to the first aspect is composed of a divided panel and an intermediate panel divided into a plurality of sections in a direction orthogonal to the longitudinal beam direction, and each of the divided panels has a longitudinal beam, The intermediate panel having no girder is a composite panel in which horizontal ribs fixed to the upper surface of the bottom steel plate project toward the split panels on both sides, and the split panel and the intermediate panel are connected with floor slab concrete via the horizontal ribs. Structure.
[0021]
According to a third aspect of the present invention, the vertical girder of the composite panel according to the first or second aspect is used as a bridge main girder, and a cross beam supported on a fulcrum such as an abutment or a pier of the bridge is fixed to an end of the vertical girder. This is a panel bridge structure using composite panels.
[0022]
The invention according to claim 4 is a continuous girder bridge in which a plurality of composite panels are arranged between fulcrums in the bridge axis direction, wherein the composite panels are arranged before and after in the bridge axis direction adjacent to a cross beam arranged on the fulcrum. The composite panel is supported by the cross beam with a shear member and an attachment plate provided at the upper end of the main girder and protruding in the bridge axis direction, and the side of the support plate and the cross beam provided at the lower end of the girder. 3. The composite according to claim 1, wherein the cross beam and the composite panel end are integrally connected to each other by a concrete filling around the portion and the coupling means provided at the end of the composite panel to form a continuous girder. Panel bridge structure using panels.
[0023]
The invention of claim 5 is a method of constructing a continuous girder type composite panel bridge according to the invention of claim 4,
(1) Arrange a cross beam on the fulcrum of the bridge,
(2) Before and after the upper end of each cross beam in the direction of the bridge axis, the shear members protruding in the direction of the bridge axis provided at the upper end of the main girder are locked and the composite panel is placed.
(3) Next, the upper end of the cross beam and the upper end of the composite panel are connected by an attachment plate.
(4) While each composite panel is supported by a simple beam, concrete is placed between the slab concrete on the bottom steel plate of each composite panel and the lateral beam side of the fulcrum, and the end of the composite panel provided with the support plate and the connecting means. This is a method of constructing a continuous composite girder bridge using a composite panel that is filled, and a cross beam and a composite panel end are integrally joined to form a continuous girder.
[0024]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described.
FIG. 1 is a perspective view showing an embodiment in which a composite panel structure according to the present invention is applied as a floor slab for a bridge. FIG. 2 is a perspective view of an embodiment in which the composite panel is composed of a divided panel (a) and an intermediate panel (b) obtained by dividing the composite panel in a direction perpendicular to the longitudinal beam direction (width direction).
[0025]
The composite panel 1 according to the present invention includes a bottom steel plate 2 and a plurality of vertical girders 3 arranged at intervals on the lower surface thereof, and horizontal ribs 4 arranged on the upper surface of the bottom steel plate 2 in a direction orthogonal to the vertical girders 3. The floor slab concrete 5 cast on the upper part of the bottom steel plate 2 has a basic configuration.
[0026]
The vertical girder 3 is mainly made of an H-beam (rolled material / built H), and also uses an I-girder or a box girder made of a shape steel such as a large channel steel, an I-beam, a CT steel, or a thick plate. You can do it. The dimensions and number of the stringers 3 are determined according to the span of the support point, dead load and live load.
[0027]
The horizontal rib 4 also serves as a stiffener for the floor slab and a dowel for the composite girder, and is made of various shaped steels (for example, H-shaped steel, channel steel, I-shaped steel, CT steel) smaller than the vertical girder 3. , Steel strip, etc.). When holes 6 are provided on the side surfaces of the lateral ribs 4 at an appropriate pitch, the filling property of the floor slab concrete 5 can be improved, and the effect of synthesizing steel / concrete can be enhanced by the dowel action.
[0028]
The bottom steel plate 2 sandwiched between the vertical girder 3 and the horizontal ribs 4 also serves as a formwork when the concrete slab 5 is cast, and itself fixes the vertical girder 3 and the horizontal ribs 4 as main girder. It is an important structural member that becomes a bonding material and adheres to the floor slab concrete 5 to form the composite panel 1.
[0029]
The concrete 5 on the bottom steel plate 2 may be cast on site or precast at a factory. Reference numeral 7 in the figure denotes a side plate at the end of the width, which serves as a side frame when the floor slab concrete 5 is cast on the bottom steel plate 2, and the reinforcing bars arranged on the horizontal ribs 4 are arranged. It is the power line 8. The holes 9, the supporting plates 10, and the formwork 11 provided at the web ends of the girder 3 are members for connecting to the cross beams 12 (see FIG. 4) installed at the fulcrums of the bridge.
[0030]
The vertical girder 3 arranged on the lower surface of the bottom steel plate 2 has an upper surface (flange) 13 fixed to the lower surface of the bottom steel plate 2 by welding, and the horizontal ribs 4 arranged on the upper surface of the bottom steel plate 2 are similarly fixed by fillet welding. Have been. The floor slab concrete 5 above the bottom steel plate 2 is cast in such a manner that the horizontal ribs 4 and the force distribution bars 8 arranged perpendicularly to the horizontal ribs 4 are buried and filled with necessary cover.
[0031]
It is not necessary to divide a small composite panel, but in the case of a large composite panel, it is necessary to divide the panel and transport it due to restrictions in shape and weight during transportation, and combine them on site.
[0032]
Conventional composite panels and steel slabs were separate from the girder, so panels (steel slabs) divided in the girder direction (bridge axis direction) were lined up and joined on the pre-installed girder. In the composite panel 1 according to the present invention, as in this embodiment, the divided panels 15 divided into a plurality in the direction orthogonal to the longitudinal beam direction are joined together using an intermediate panel 16 on site.
[0033]
The divided panel 15 preferably has two or more longitudinal beams 3 as a structural member, and the intermediate panel 16 connects the divided panels 15 on both sides. The connecting means of the intermediate panel 16 is such that the horizontal ribs 4 fixed to the upper surface of the bottom steel plate 2 of the intermediate panel 16 protrude and extend to the upper surface of the bottom steel plate 2 of the split panels 15 on both sides, and the floor slab concrete 5 is adhered.
[0034]
FIG. 2 shows the split panel 15 and the intermediate panel 16 in an exploded state. Each divided panel 15 fixes the upper ends of two or more stringers 3 to the lower surface of the bottom steel plate 2, and fixes the horizontal ribs 4 to the upper surface of the bottom steel plate 2 at intervals in the orthogonal direction to the stringers 3. I have.
[0035]
The receiving member 17 provided at the end of the bottom steel plate 2 covers a gap with the end of the intermediate panel 16 and is sealed so as not to leak when the concrete slab 5 is cast.
[0036]
The intermediate panel 16 does not have the longitudinal beams 3, and the lateral ribs 4 are fixed to the upper surface of the bottom steel plate 2 having a width that can be accommodated between the adjacent divided panels 15 so as to project in the direction of the divided panels on both sides.
[0037]
The horizontal ribs 4 fixed to the intermediate panel 16 are provided at positions shifted from the positions of the horizontal ribs 4 of the split panels 15 on both sides. The intermediate panel 16 is inserted between the adjacent split panels 15 after the split panels 15 are installed, and is connected to the floor slab concrete 5 via the horizontal ribs 4 extending to the split panels 15 on both sides provided on the upper surface of the bottom steel plate 2. And the divided panels 15 on both sides are joined and integrated.
[0038]
If the length of the panel in the bridge axis direction (span) exceeds the transportable length, transport it by dividing it in the bridge axis direction, then weld the panels divided in the bridge axis direction at the erection point and connect them with bolts After that, it is lifted by a crane and placed on the cross beam 12.
[0039]
In the composite panel structure of the present invention, if the cross beams 12 are fixed to both ends of the girder and the cross beams 12 are supported on the fulcrum of the abutment or pier 18, a panel bridge 19 using the girder 3 as a main girder is obtained. Hereinafter, in the panel bridge 19, the vertical girder 3 of the composite panel 1 is the main girder of the bridge, but is described as the vertical girder 3.
[0040]
In a small span bridge of a simple girder type, a panel bridge can be constructed only by mounting the composite panel 1 on the abutment 18. In this case, it can be constructed by simply fixing the cross beam 12 having a higher girder height than the vertical girder 3 to the end of the vertical girder (main girder) 3 of the composite panel by welding or bolting, and placing it on the pier or abutment 18. The connecting between the cross beam 12 and the composite panel 1 may be performed by using a concrete connecting means described later (a connecting means between the horizontal beam 12 at the bridge fulcrum and the composite panel 1 shown in FIG. 4).
[0041]
Further, the panel panel 19 can be constructed by connecting the divided panels 15 divided in the width direction with the intermediate panel 16. When the floor slab is constructed after the conventional main girder and cross girder is erected, a shoring and a hanging scaffold are required. However, in the panel bridge 19 of the present invention, the joining work between the divided panels 15 and the fulcrum of the bridge All the fixing work with the installed cross beam 12 can be performed on the bridge surface.
[0042]
In addition, even in the case of continuous girder, the panel 1 can be installed and the concrete slab 5 can be installed alone for each span. If the entire main girder and horizontal girder are not completed like the conventional continuous girder bridge, the slab A major feature is that it does not require construction management that does not allow construction, making it suitable for rapid construction.
[0043]
The panel bridge 19 of the present invention is particularly advantageous, for example, when replacing an existing bridge while partially using an overpass, an urban viaduct, or a lane in which it is necessary to reduce the work time under the girder. In this case, while dismantling and removing one lane part of the existing bridge while using one lane of the existing bridge, installing the cross beam 12 on the fulcrum pier 18, installing the split panel 15 and the intermediate panel 16, and installing the floor slab Concrete 5 can be cast to partially complete the bridge for one lane. After that, the operating lane is switched and one side lane is dismantled and removed. Similarly, the split panel 15 and the intermediate panel 16 are installed, the concrete slab 5 is cast, and the partially completed bridge is integrated with the full width bridge. Complete the replacement.
[0044]
Next, in a multi-span bridge, a continuous girder type bridge structure using the composite panel 1 according to the present invention will be described. In the conventional continuous girder bridge, there was a problem in the construction of continuity, but in the composite panel 1 of the present invention, the continuation construction can be easily performed.
[0045]
FIG. 3 is a side view showing an embodiment of a panel bridge structure of a three-span continuous girder bridge using the composite panel 1 according to the present invention. The composite panel 1 supported by the piers 18 of P1 to P4 is P2. , P3, the composite panel 1 of both diameters is formed into a continuous girder structure via the cross beam 12 supported on the intermediate pier (fulcrum) 18 of the pier.
[0046]
FIG. 4 is an exploded perspective view showing a joint between the cross beam 12 at the bridge fulcrum and the composite panel 1. The composite panel 1 joins the above-mentioned split panel 15 with the intermediate panel 16 and therefore will not be described, and the connection between the end panel and the cross beam 12 will be described in detail.
[0047]
The cross beam 12 supported by the pier (fulcrum) 18 of the bridge uses a steel I-girder slightly larger than the girder height of the composite panel 1, and has a bolt hole 21 for an attachment plate in the upper flange 20. The cross beam 12 may be an H-beam or a box girder.
[0048]
Further, a vertical stiffener 22 is provided on the side surface of the cross beam 12 at intervals, and a plate material (not shown) is provided on the lower flange 23 for fitting the end frame of the composite panel 1. I have.
[0049]
A shear member 25 is projected from the upper end of the stringer 3 end of the composite panel 1 in the bridge axis direction (toward the cross beam), and the shear member 25 is received when the panel 1 is set on the cross beam 12. It is used as a material and after completion it is used as a shear force transmitting material.
[0050]
Also, a number of bolt holes 31 are provided in the upper flange 26 at the end of the panel vertical girder 3, and an attachment plate 27 vertically arranged between the bolt holes 21 provided in the flange 20 of the cross beam 12 is bolted. (The illustration of bolts is omitted).
[0051]
The attachment plate 27 may have a shape in which a portion that interferes with the shear member 25 is cut out. In the illustrated example, the attachment plate 27 having a substantially trapezoidal planar shape is arranged on both sides of the shear member 25.
The bolted attachment plate 27 connects the cross beam 12 and the longitudinal beam 3 against the tensile force generated by the negative bending moment of the fulcrum.
[0052]
A support plate 10 reinforced with a bracket 28 toward the side surface of the cross beam 12 is fixed to the lower end of the vertical girder 3. This support plate 10 resists the compressive force generated by the negative bending moment of the fulcrum after the surrounding concrete is hardened. In addition, a number of holes 9 are formed in the side surface of the web end of the stringer 3. This hole 9 is a connecting means for penetrating the reinforcing bar 30 for integration with the filled concrete.
[0053]
The plate provided obliquely from the upper end to the lower end of the stringer 3 is a form 11 for filling concrete, and is left as it is after hardening of concrete. 11a is a side mold.
[0054]
FIG. 5 is a perspective view of a fulcrum structure of a continuous girder bridge. Is supported at the upper end of the cross beam 12, and the flange 20 of the cross beam 12 and the upper flange 26 of the longitudinal beam 3 of the composite panel 1 are bolted together by a contact plate 27 (bolts are not shown). In addition, a reinforcing bar 30 is passed through a hole 9 formed in the side surface of the web end of the stringer 3 in order to integrate (join) with concrete. A support plate 10 is provided at the lower end of the vertical girder 3.
[0055]
Although FIG. 5 does not show the filled concrete, the side portions (shown by dotted lines) of the cross beams 12 are filled with the concrete in a state where the formwork 11 and 11a are set.
[0056]
FIG. 6 is a cross-sectional view of the continuous fulcrum structure after the concrete is filled. A cross beam 12 is installed on a pier 18 at an intermediate fulcrum of a panel bridge 19, and panels are provided on both ends of the upper end of the cross beam 12 in the longitudinal direction of the bridge axis. The shear member 25 at the end of the vertical girder is supported, the upper end is joined by the attachment plate 27, and the concrete is filled around the lower supporting plate 10 and the joining means provided on the side. The floor slab concrete 5 is cast on the cross beam 12 and the upper part of the girder 3 so as to bury the shear member 25 therein. Note that reference numeral 8 in the drawing is a distribution muscle. Reference numeral 39 denotes a bearing.
[0057]
As described above, the continuous structure of the intermediate fulcrums P2 and P3 of the continuous girder bridge has been described. However, since the bridge end fulcrums P1 and P4 have the composite panel 1 on only one side, the connection with the cross beam 12 is one side as shown in FIG. It becomes.
[0058]
Next, a method of constructing the continuous composite girder bridge 19 using the composite panel 1 according to the present invention will be described mainly on the continuation of the intermediate pier.
[0059]
The construction method of the continuous composite girder bridge using the composite panel of the present invention is performed in the following procedure.
{Circle around (1)} On the pier 18 at the intermediate fulcrum of the bridge, the cross beam 12 having an attachment plate bolt hole 21 in the upper flange 20 and provided with coupling means is provided,
{Circle around (2)} The shear member 25 is projected from the upper end of the stringer 3, the bolt hole 31 for the attachment plate is provided on the upper flange 26, the supporting plate 10 is provided on the lower end, and the hole provided on the web side surface of the stringer 3. 9, the shear members 25 at the ends of the composite panel 1 are locked and placed before and after the upper end of each cross beam 12 in the direction of the bridge axis using the composite panel 1 provided with coupling means such as 9.
{Circle around (3)} Next, an attachment plate 27 is disposed at the upper end of the cross beam 12 and the upper end of the composite panel 1 and bolted together, and a reinforcing bar 30 is passed through the hole 9 of the coupling means.
(4) Each composite panel 1 is supported by a simple beam, and concrete 33 is filled between the slab concrete 5 on the bottom steel plate 2 of each composite panel 1 and the lateral beam side of the fulcrum and the composite panel end, and The support plate 10 provided at the lower end of the girder 3, the side of the cross beam 12 and the connecting means provided at the end of the composite panel 1 are integrated, and the cross beam 12 and each composite panel 1 are continuously connected in the bridge axis direction. And
[0060]
The other intermediate piers 18 are also constructed in a similar procedure. Further, as shown in FIG. 7, the pier (abutment) 18 at the end of the bridge has the end of the composite panel 1 connected to only one of the cross beams 12.
[0061]
When the split panel 15 is used in the construction means for mounting the composite panel 1 on the cross beam 12, the split panel 15 is mounted on one side in the width direction of the cross beam 12 installed on the fulcrum, and the shear member 25 is mounted. It is possible to use intercepting means for sequentially moving the upper surface of the cross beam 12 to a predetermined position by a temporary slide mechanism (a roller, a slide plate, or the like) provided below. The intermediate panel 16 may be placed and moved on one side similarly to the divided panel 15, or may be inserted between the divided panels 15 later.
[0062]
With the above means, the working radius of the crane that lifts the split panel 1 on the cross beam 12 can be reduced, so that a heavy-weight crane is not required.
[0063]
In the present invention, when the concrete 33 is cast between the side of the floor slab 5 and the lateral beam 12 of the fulcrum and the end of the composite panel 1, the composite panel 1 is bolted to the shear member 25 and the attachment plate 27 on the fulcrum. Since it is in the state of a simple beam as a joint (hinge), no negative bending moment is generated at the fulcrum portion, and no tensile force acts on the floor slab concrete 5, so that no cracking occurs. After completion of the bridge, the concrete at the fulcrum is hardened to form a continuous girder structure, but the negative bending moment on the fulcrum due to the vehicle load (live load) is small, and the supporting plate at the lower part of the girder resists the compressive force. can do.
[0064]
8 (a) to 8 (d) show an application example of a panel bridge 19 using the composite panel 1 according to the present invention, wherein (a) is a bridge-shaped ramen bridge, (b) is a continuous ramen bridge, (C) shows a reverse cable-stayed bridge provided with an outer cable 38, and (d) shows a side view applied to a truss bridge. In addition, the present invention can be applied to a suspension bridge or an arch bridge.
[0065]
In the above-mentioned application example, in the truss bridge of (d), in the truss bridge of the composite panel 1, the fulcrum P of the lower chord material 34, the vertical material, and the diagonal material 35 which constitute the truss structure other than the pier and the abutment 18 are used. I do. Further, in the case of a suspension bridge or an arch bridge, the composite panel 1 is supported by an intermediate horizontal girder 36 connecting the large vertical girder 37 between both large vertical girder 37 in the bridge axis direction.
[0066]
【The invention's effect】
In the composite panel of the present invention, the upper surfaces of the plurality of stringers arranged on the lower surface of the bottom steel plate are fixed, and a plurality of horizontal ribs are fixedly arranged on the upper surface of the bottom steel plate in a direction orthogonal to the stringers. Since the floor slab is filled with concrete so as to be buried and integrated, the horizontal ribs stiffen the bottom steel plate and have a high rigidity composite panel structure integrated with concrete.
[0067]
In addition, when installing on bridges or other structures, the girder of the composite panel plays the role of the main girder, so there is no need to separately install the main girder, so the erection process is omitted, and the work scaffold below the girder is Not required. In addition, since the upper surface of the stringers is fixed to the lower surface of the bottom steel plate having increased rigidity by fixedly arranging a plurality of horizontal ribs in the orthogonal direction, it is not necessary to prevent a lateral buckling buckling member between the stringers. And installation work can be omitted. Furthermore, since the bottom steel plate also serves as a formwork, there is no need to install a formwork when slab concrete is cast.
For this reason, it has a great effect on shortening the construction period of the installation work of the composite panel on site and reducing costs.
[0068]
Also, in the case where the composite panel is divided due to restrictions on transportation, etc., the divided panels divided in the direction perpendicular to the longitudinal girder are joined by attaching floor slab concrete via horizontal ribs fixed to the upper surface of the bottom steel plate of the intermediate panel. Therefore, the joining operation of the divided panels can be extremely easily performed from the bottom steel plate, and there is no problem that a fatigue defect of a weld portion occurs after completion.
[0069]
A panel bridge can be constructed very easily with only a short construction period simply by installing the stringer of the composite panel of the present invention as a main girder and fixing a cross beam at the end of the girder to a pier or abutment.
[0070]
In particular, in the construction method of replacing an existing bridge while using one lane, when the split panel is used, one of the existing lanes is used while one lane of the existing bridge is dismantled and removed. Intermediate panels can be installed and concrete slabs can be cast in the bridge to replace the bridge in each lane in a short period of time.
[0071]
In addition, in a continuous girder bridge using multiple composite panels in a multi-span bridge, the upper end of the cross beam provided on the intermediate fulcrum supports the shear member projecting in the bridge axis direction provided at the upper end of the vertical girder of the composite panel. Then, the upper end of the cross beam and the upper end of the vertical girder can be connected by an attachment plate to resist the tensile force. In addition, connecting means are provided at the lower end of the girder and at the side of the support plate and the cross beam and at the end of the composite panel, and the surroundings are filled with concrete to form an integrated connection. At the upper end, concrete is poured in a state of a simple beam hinged by a shearing member and an attachment plate, so that there is no fear of cracking of the upper part of the concrete due to a negative bending moment during construction.
[0072]
In addition, the bearing plate at the lower end of the girder embedded in the concrete resists the compressive force against the negative bending moment of the intermediate fulcrum due to the live load of the vehicle after the bridge is completed. For this reason, it is possible to obviate the countermeasures such as the restriction of the concrete placing order with respect to the negative bending moment of the intermediate fulcrum portion at the time of concrete placing of the continuous girder and the placing of the fulcrum lifting concrete, which have conventionally been problems.
[Brief description of the drawings]
FIG. 1 is a perspective view showing an embodiment of a composite panel structure according to the present invention.
FIG. 2 is a perspective view of a divided panel (a) obtained by dividing a composite panel according to the present invention in a direction perpendicular to a bridge axis and an intermediate panel (b) for connection.
FIG. 3 is a side view of an embodiment of a panel bridge structure of a three span continuous girder bridge using the composite panel according to the present invention.
FIG. 4 is an exploded perspective view showing a connecting portion between a cross beam of a bridge fulcrum and a composite panel.
FIG. 5 is a perspective view of a fulcrum structure of a continuous girder bridge according to the present invention.
FIG. 6 is a partial longitudinal sectional view of an intermediate fulcrum structure of a continuous girder bridge.
FIG. 7 is a partial longitudinal sectional view of an end fulcrum structure.
FIGS. 8A to 8D are views showing application examples of the panel bridge of the present invention.
[Explanation of symbols]
1 composite panel
2 bottom steel plate
3 stringers
4 horizontal ribs
5 concrete floor
6 holes
7 Side plate
8 Distributors
9 holes
10 Support plate
11 Formwork
12 Cross beam
13 Top
15 split panel
16 Intermediate panel
17 Materials
18 Pier (Abutment)
19 Panel bridge (or continuous composite girder bridge)
20 Upper flange
21 bolt holes
22 Vertical stiffener
23 Lower flange
25 Shear members
26 Upper flange
27 Attaching plate
28 Bracket
29 holes
30 rebar
31 bolt hole
33 concrete
34 Lower chord material
35 diagonal
36 Intermediate horizontal girder
37 Large Column
38 Outside cable
39 bearing
P fulcrum
K rating

Claims (5)

The upper surface of the plurality of stringers arranged at intervals on the lower surface of the bottom steel plate is fixed, and the plurality of horizontal ribs are fixedly arranged on the upper surface of the bottom steel plate in the direction orthogonal to the stringers, Composite panel structure characterized by being filled with floor slab concrete so as to bury the interior. The composite panel is composed of a divided panel and an intermediate panel that are divided into a plurality of pieces in a direction orthogonal to the stringer direction, and each of the divided panels has a stringer, and the intermediate panel without the stringer is fixed to the bottom steel plate upper surface. 2. The composite panel according to claim 1, wherein the divided horizontal ribs project toward the divided panels on both sides, and each divided panel and the intermediate panel are connected to each other with floor slab concrete via the horizontal ribs. Construction. The composite panel according to claim 1 or 2, wherein the vertical beam of the composite panel is used as a main beam of the bridge, and a horizontal beam supported on a fulcrum of the bridge is fixed to an end of the vertical beam. Panel bridge structure. A continuous girder bridge in which a plurality of composite panels are arranged between fulcrums in the bridge axis direction, wherein composite panels are arranged in front and rear in the bridge axis direction adjacent to cross beams arranged on the fulcrums, A shear member provided at the upper end of the girder serving as the main girder and a shearing member protruding in the direction of the bridge axis and an abutment plate are supported by the cross beam, and the side portions of the support plate and the cross beam provided at the lower end of the girder and the end of the composite panel The composite panel according to claim 1 or 2, wherein the cross beam and the end of the composite panel are integrally connected to each other by a connecting means provided in the above and the concrete filled therearound to form a continuous girder. Panel bridge structure used. It is a construction method of the continuous girder bridge according to claim 4,
(1) Arrange a cross beam on the fulcrum of the bridge,
(2) Before and after the upper end of each cross beam in the direction of the bridge axis, the shear members protruding in the direction of the bridge axis provided at the upper end of the main girder are locked and the composite panel is placed.
(3) Next, the upper end of the cross beam and the upper end of the composite panel are connected by an attachment plate.
(4) While each composite panel is supported by a simple beam, concrete is placed between the slab concrete on the bottom steel plate of each composite panel and the lateral beam side of the fulcrum, and the end of the composite panel provided with the support plate and the connecting means. A method of constructing a continuous composite girder bridge using a composite panel, characterized in that a continuous girder is formed by filling and connecting a cross beam and an end of a composite panel integrally.

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