JP3881598B2 - Composite truss segment and truss bridge with suspension cable using the same and its construction method - Google Patents

Composite truss segment and truss bridge with suspension cable using the same and its construction method Download PDF

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Publication number
JP3881598B2
JP3881598B2 JP2002181464A JP2002181464A JP3881598B2 JP 3881598 B2 JP3881598 B2 JP 3881598B2 JP 2002181464 A JP2002181464 A JP 2002181464A JP 2002181464 A JP2002181464 A JP 2002181464A JP 3881598 B2 JP3881598 B2 JP 3881598B2
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Japan
Prior art keywords
truss
suspension cable
bridge
composite
combined
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JP2002181464A
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Japanese (ja)
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JP2004027516A (en
Inventor
卓 吉川
博光 柳内
裕司 神谷
周 角本
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オリエンタル建設株式会社
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Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a suspension cable combined truss bridge in which a truss girder is stiffened with a suspension cable, a construction method thereof, and a composite truss segment used therein.
[0002]
[Prior art]
Conventionally, as a bridge, a suspension bridge using a suspension cable, a truss bridge, or a truss structure bridge using a suspension cable described in Japanese Patent Laid-Open No. 2001-182016 is known.
[0003]
In general, a suspension bridge as a bridge structure type has a large vibration and dripping, and a suspension floor type bridge and an upper type suspension floor slab bridge are not as large as the above-mentioned suspension bridge, but also vibration and dripping become problems.
[0004]
On the other hand, the truss bridge has the advantage that the construction height is high, the truss is large, and the rigidity is large.
[0005]
Considering the construction site, if the construction cost of the construction road for constructing intermediate piers is large for mountainous bridges, bridges between single diameters are selected, and the bridge type between these single diameters is selected. For example, steel Neelsen Rose bridge and PC rigid frame bridge with fixed both ends are adopted, but the former steel Nielsen Rose bridge structure type must use cable crane for erection and bridge Installation may be difficult depending on the topographical conditions of the back. Further, the structure type of the latter-end-fixed hinged PC rigid frame bridge may be excessively deformed by creep and impair usability.
[0006]
Furthermore, although an upper-path type PC suspended floor slab bridge has been proposed recently, both the dead load and live load are borne by the tension of the suspended floor slab, so the horizontal force acting on the lower structure becomes excessive when the span is long, The upper floor slab supported by the vertical member may roll excessively.
[0007]
As a method for constructing a bridge, a general method for constructing a truss-structured bridge is a method of assembling a support work and constructing a truss structure thereon. In some cases, it is constructed from a bridge pier or abutment by an overhanging method without providing support.
[0008]
Furthermore, as described in Japanese Patent Application Laid-Open No. 2001-182016, a truss bridge using a cable is provided with a side floor triangular unit serving as a lower floor slab and diagonal material on a cable stretched between abutments. There is also known a method for constructing a curved truss bridge in which an upper floor slab is installed after hanging.
[0009]
[Problems to be solved by the invention]
In the case of the curved truss bridge disclosed in the above-mentioned Japanese Patent Application Laid-Open No. 2001-182016, it is necessary to separately construct the side triangular unit and the upper floor slab, between the side triangular unit and the upper floor slab. Are cast by cast-in-place concrete, so that the construction is complicated, the construction period is long, and the construction cost is high.
[0010]
An object of the present invention is to provide a unitized composite truss segment that can be used for a truss bridge with a suspended cable. Possible to provide a structure-type suspension cable combined truss bridge in which a truss girder such as a composite truss simple girder is stiffened with a suspension cable as a bridge between single diameters in a mountainous area, etc., and its construction method and composite truss segment For the purpose.
[0011]
Another object of the present invention is to provide a suspension cable combined truss bridge that is easy to construct and can be constructed in a short construction period and a construction method thereof using the unitized composite truss segment.
[0012]
[Means for Solving the Problems]
In order to advantageously solve the above problem, the composite truss segment according to claim 1 of the present invention is a composite truss segment 10 used for a truss bridge 22 with a suspension cable, and the composite truss segment 10 is a first chord. The upper floor slab 2 also serving as the material 1 and the lower chord material 4 and 6 integrally provided via the truss structure belly material A provided with the vertical materials 3 and 5 for joining in the bridge axis direction. And a saddle 11 for a suspension cable.
[0013]
Moreover, in invention of Claim 2, in the composite truss segment of Claim 1, the said abdominal material A is the vertical materials 3 and 5 arrange | positioned at intervals in the bridge axis direction, and these vertical materials 3 and 5 A bolt hole 20 for joining the composite truss segments 10 adjacent to each other in the bridge axis direction is provided in the vertical members 3 and 5. 5 is provided with an interval in the vertical direction.
[0014]
Further, in the invention according to claim 3, in the composite truss segment according to claim 1 or 2, the gap is provided in the bridge axis direction on both sides in the direction perpendicular to the bridge axis at the lower part of the concrete upper floor slab 2 also serving as the upper chord material 1. The upper parts of the vertical members 3 and 5 are fixed to both ends, respectively, and the lower chord material 4 is arranged and fixed over the vertical members 3 on one side of the bridge axis perpendicular direction, and other parts in the direction perpendicular to the bridge axis. The lower chord material 6 is disposed and fixed over the lower part of each vertical material 5 at the side, and the vertical material 3 (5) and the lower chord material 4 (6 The saddle member 7 is disposed and fixed in a portion surrounded by the vertical axis 3 and 5 facing the direction perpendicular to the bridge axis, and the saddle support member 9 is fixedly mounted on the lower portion of the saddle support member 9. And suspension cable 12 Saddle 11 for mounting to the suspension cable, characterized in that it is fixed.
[0015]
Furthermore, in the truss bridge combined with the suspension cable according to claim 4, the suspension cable stretched between the abutments 13 using the composite truss segment according to any one of claims 1 to 3. 12, the saddle 11 for the suspension cable in the multiple composite truss segments 10 is placed on the suspension cable 12 and the vertical members 3 and 5 in the composite truss segments 10 adjacent to each other in the bridge axis direction are joined together. A composite truss girder 23 is configured, and further, the composite truss girder 23 is supported by the suspension cable 12, and the load is distributed by the suspension cable 12 and the truss girder 23.
[0016]
Furthermore, in the suspension cable combined truss bridge according to claim 5, the suspension cable combined truss bridge according to claim 4 has the suspension cable 12 fixed at both ends of the composite truss girder 23 and the abutment 13 side. This is characterized in that the tension of the suspension cable 12 is released and is self-contained.
[0017]
In addition, in the construction method of the suspension cable combined truss bridge according to claim 6, after a plurality of suspension cables 12 are stretched between the abutments 13, the composite according to claim 1. The truss segments 10 are sequentially placed on the suspension cable 12, the composite truss segments 10 are sequentially sent out, and the end vertical members in the composite truss segments 10 adjacent to each other in the bridge axis direction are joined together by high tension bolts 21. Thus, the composite truss girder 23 is constructed, and the composite truss girder 23 is supported by the suspension cable 12 while the composite truss girder ends are mounted on the abutment 13.
[0018]
Moreover, in the construction method of the suspension cable combined use truss bridge according to claim 7, after the suspension cable combined use truss bridge 22 according to claim 6 is constructed, the suspension cable 12 is fixed to both ends of the composite truss girder 23, and It is characterized in that the tension force at the end of the suspension cable engaged with the abutment 13 is released, and the reaction force of the suspension cable 12 acting on the abutment 13 is released.
[0019]
Furthermore, in the invention of claim 8, in the construction method of the suspension cable combined use truss bridge of claim 6, the suspension cable 12 in the abutment 13 part is left without being cut and the suspension cable combined use truss bridge 22 is used after the suspension. It is characterized in that the suspension cable combined truss bridge can be disassembled and removed by a procedure reverse to the construction method of the cable combined truss bridge.
Furthermore, in invention of Claim 8, in the construction method of the suspension cable combined use truss bridge of Claim 7, leaving the suspension cable 12 of the abutment 13 part without cutting and using the suspension cable combined truss bridge 22 The suspension cable 12 in the abutment 13 portion is tensioned and fixed on the abutment 13, and the suspension cable combined truss bridge can be disassembled and removed by a procedure reverse to the construction method of the suspension cable combined truss bridge. .
[0020]
According to the present invention, the following actions and effects are obtained.
1. Suspension bridges that do not use trusses, such as conventional ones, have large vibrations and drooping problems. However, by using a truss girder together with the suspension cables, the high rigidity of the truss girder suppresses vibrations and sags of the suspension bridge. In addition, the suspension cable combined truss bridge that can be used as a road without the above-mentioned problem even when the vehicle passes on the upper floor slab can be obtained.
2. By using the suspension cable and the truss girder together, the height of the truss girder can be reduced, the construction cost of the suspension cable combined truss bridge can be reduced, and the cost is reduced.
3. Instead of using a flat concrete lower floor slab, instead of using a straight lower chord material, the weight of the truss bridge with suspension cable is reduced.
4). A composite truss segment with a simple unit structure consisting of upper floor slabs, diagonal materials, vertical materials, and lower chord materials is constructed, and this construction leads to a shortened construction period and cost reduction.
6). The suspension cable combined truss bridge can be easily removed, for example, by a procedure reverse to the construction procedure, and is advantageous as a temporary road.
7). The suspension cable is fixed to the truss girder in the vicinity of the end, and the tension of the suspension cable on the abutment side is released, so that it can be used as a main bridge. (The suspension cable is fixed to the abutment and the abutment is balanced by anchoring with a ground anchor, etc. However, if anchored for a long time, the anchoring force will gradually weaken. Abutment (cut off the abute and fix it on the bridge. This is called self-restraint.)
8). In the case of the present invention, when using a truss bridge combined with a suspension cable with an anchor attached to the abutment as a reaction body of the suspension cable (when using a truss bridge combined with other suspension type suspension cables) It is possible to use either of the two methods of releasing the reaction force acting on the ground anchor (if necessary) and fixing it to the bridge body (truss girder). It is also possible to change between the two methods (or from the self-contained type to the other type), and the self-contained type or the other type can be selected as appropriate according to the use conditions. Further, the self-contained type is advantageous as a truss bridge combined with a suspension cable, and the other type is advantageous as a truss bridge combined with a temporary suspension cable because it can be easily removed later. In addition, in the case of either the other type or the self-contained type, it can be a truss bridge combined with a permanent or temporary suspension cable depending on the use conditions and the like.
[0021]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
First, the form of the composite truss segment 10 used in the suspension cable combined truss bridge according to the first embodiment of the present invention will be described with reference to FIGS. 5 to 7. An upper floor slab 2 made of reinforced concrete that also serves as the upper chord material 1. The upper parts of the vertical members 3 and 5 made of steel pipe are embedded and fixed at both ends of the bridge axis direction on both sides of the lower part of the bridge axis and the vertical members 3 on one side of the bridge axis direction are fixed. The lower chord material 4 extending in the bridge axis direction is arranged and fixed over the lower portion, and the lower chord material extending in the bridge axis direction over the lower portion of each vertical material 5 on the other side portion in the direction perpendicular to the bridge axis. 6 is disposed and fixed, and a pair of diagonal members is provided in a portion surrounded by the lower part of both sides of the concrete upper floor slab 2 in the direction perpendicular to the bridge axis and the vertical member 3 (5) or the lower chord member 4 (6). 7 is arranged in an inverted V shape, The upper and lower slabs 2 and the vertical members 3 (5) or the lower chord members 4 (6) are fixed to the upper and lower portions of the diagonal member 7, and the vertical members 3, 5 and the bridge shaft on one end side in the bridge axis direction facing the direction perpendicular to the bridge axis. Saddle support members 8 and 9 made of steel pipe are installed on the vertical members 3 and 5 on the other end side in the direction, fixed by bolts or welding, and placed on a suspension cable below the saddle support members 8 and 9. A plurality (six in the illustrated example) of downward-opening groove-shaped saddles 11 are disposed and fixed at intervals in the direction perpendicular to the bridge axis. The vertical material 3 (5) and the diagonal material 7 constitute a stomach material A.
For fixing the vertical members 3 (5) and the diagonal members 7 or the lower chord members 4 (6) arranged in the same vertical plane in the composite truss segment 10, anchor bolts or the like are used when they are made of concrete. In the case of steel, it is by means of bolts or welding.
[0022]
The saddle support members 8 and 9 attached to the front vertical members 3 and 5 and the rear vertical members 3 and 5 in the bridge axis direction of the composite truss segment 10 are attached to the suspension cable on which the composite truss segment 10 is installed. The level of the saddle 11 is determined by the mounting position of the saddle support members 8 and 9 in advance. The composite truss segment 10 of the form shown in FIGS. 5, 6, and 7 is in the middle part, the end part, and the central part in the state in the middle of construction shown in FIG. 3 and in the completed truss bridge with suspension cable shown in FIG. The form of the composite truss segment 10 located in the vicinity is shown as a representative.
[0023]
In order to reduce friction with the suspension cable, an ethylene tetrafluoride plate having an arcuate cross section is interposed on the inner peripheral surface of the groove 11a having an arcuate cross section extending in the bridge axis direction of the saddle 11. Damage to the polyethylene pipe having a curved shape in the bridge axis direction on the lower surface of the concave groove 11a is prevented.
[0024]
The saddle support members 8 and 9 are reinforced by the reinforcing members 31 such as diagonal members fixed to the vertical members 3 and 5 and the saddle support members 8 and 9. In addition, although not shown, a fixed or detachable connecting portion for pulling the composite truss segment 10 with a pulling rope is provided at an appropriate position of the end portion of the composite truss segment 10.
[0025]
Each of the composite truss segments 10 is preferably assembled and constructed in the vicinity of the construction site. The precast upper floor slab 2, the steel pipe or precast concrete vertical members 3 and 5, the lower chord member 4, 6 may be manufactured, and these members may be conveyed and assembled by bolt joining or the like. Further, in order to make the joint surfaces of the end faces of the composite truss segments 10 adjacent to each other in the bridge axis direction that have already been built, as shown in FIG. 4, the end faces of the built-up composite truss segments 10 (10A) ( In particular, the upper floor slab 2) is used as a formwork or the like, and a new composite truss segment 10 (10B) (especially the upper floor slab 2 may be a match cast concrete slab that is advantageous for joining) is constructed. All the truss segments 10 may be constructed by repeating the process of transporting the truss segments 10 from a crane or the like. In the case where the lower chord material 4 is made of concrete, when a truss bridge 22 with a suspension cable described later is constructed, a bridge shaft is placed in the lower chord material 4 in order to reduce the tension due to a post-mortem load or a live load. A PC steel material is embedded and fixed in the direction, and prestress may be introduced by the PC steel material.
[0026]
Next, a suspension cable combined truss bridge of the present invention and a construction method thereof using the composite truss segment 10 will be described based on a first embodiment as a representative form. About 2nd-4th embodiment, a different part is mainly demonstrated.
First, as shown in FIG. 1A, an abutment 13 that is opposed to each other with an interval as an abutment serving as a reaction force support portion is anchored to the ground 15 by a plurality of ground anchors 14 and is suspended from each abutment 13. A plurality (six in the illustrated case) of steel or the like casing pipe 16 for inserting the end of the cable is embedded and fixed at intervals in the direction perpendicular to the bridge axis and penetrates the abutment 13 in the bridge axis direction. So as to be embedded and fixed.
[0027]
Next, as shown in FIG. 2, each abutment 13 is provided with a plurality of winches 17, 18 in a direction perpendicular to the bridge axis, and a support wire 19 such as a steel rope is disposed across the drums of each winch 17, 18, The leading end side 12a of the suspension cable 12 composed of a plurality (six in the illustrated example) of prefabricated cables is inserted into the casing tube 16 of one abutment 13, and each suspension is shown in FIG. While supporting the front end of the cable 12 by the support wire 19, the winches 17 and 18 are driven to feed the suspension cables 12 while winding the support wires 19 around the drum of the winch 18. With the end of 12 at the back side of the abutment 13 and the tension of the suspension cable 12 by a jack or the like in a preset tension state, a known suspension cable insertion sleeve And by fixing a hanging cable 12 by the wedge type fixing member or the like using a wedge, erection each hanging cable 12 between abutments 13 (tension). By using a prefabricated cable as the suspension cable 12, the grouting operation into the outer tube 16 made of a steel casing tube or the like can be omitted.
[0028]
Next, as shown in FIG. 3, one abutment 13 is sequentially formed in order from the composite truss segment 10 (the form shown in FIG. 6) on the end side shown in the representative form of FIGS. (13a) The composite truss segment 10 is suspended from the six suspension cables 12 by a crane or the like (not shown) from the side, and the suspension cable 12 And is moved toward the other abutment 13 (13b) by the tow rope connected to the connecting portion of the composite truss segment 10 to reach the other abutment 13 (13b). In addition, the end part of the composite truss segment 10 on the end side is appropriately leveled and placed on the support device on the abutment 13. In addition, the code | symbol 30 in a figure is a scaffold.
[0029]
Thereafter, the composite truss segment 10 is sequentially transported and mounted on the suspension cable 12 by a crane or the like, and the suspension cable 12 is directed from one abutment 13 (13A) to the other abutment 13 (13B) as shown in FIG. The composite truss segment 10 placed on the vehicle is sequentially pulled and sent out, sent to a predetermined position so as to match the end face of the composite truss segment 10 already arranged, and the composite truss segment 10 sent to the predetermined position is As shown in FIG. 8, high tension bolts 21 are inserted between the vertical members 3 in adjacent composite truss segments 10 across the bolt insertion holes 20 spaced in the vertical direction. The structure is such that the shearing force is transmitted by the high tension bolt 21 by being joined by the tension bolt 21. The high tension bolt may be a joint using a friction welding type or a driving type high strength bolt.
[0030]
Thereafter, the composite truss segment 10 is sequentially placed on the suspension cable 12 and sent out, arranged at a predetermined position, and then joined by the high tension bolt 21, and the last composite truss segment 10 is placed on the suspension cable 12. The end of the composite truss segment 10 on the rear end side is appropriately leveled up with a support device (not shown) on the abutment 13 as appropriate. To engage. Then, as shown in FIG. 9, the truss girder 23 is constructed, and each suspension cable 12 is used as a main cable for the bridge completion system, and the truss girder 23 is supported by these suspension cables 12. Build the bridge 22. In addition, after constructing the truss girder 23, road pavement is provided on the upper surface of the upper floor slab 2 at an appropriate time.
As described above, since the unitized composite truss segment 10 is used, it is possible to save work and shorten the construction period.
In addition, when joining the composite truss segments 10 with the high tension bolts 21, the composite truss segments 10 may be joined sequentially as described above, but in a state where the composite truss segments 10 of 3 to 4 units are in series, When the first first and second composite truss segments 10 are joined to each other by the high-tensile bolt 21, the adjacent composite truss segments 10 are not displaced or opened, and the composite truss segments 10 are relatively easily raised. It can be joined with a tension bolt 21. Further, in order to prevent the adjacent composite truss segments 10 from being displaced and opened, all the composite truss segments 10 are installed on the suspension cable 12, and then the adjacent composite truss segments 10 are joined to each other by the high tension bolt 21. You may make it do. Therefore, the position of the bolt insertion hole 20 provided in the vertical member 3 (5) is, for example, in a state where all the composite truss segments 10 are placed on the suspension cable 12 and the bolt insertion holes 20 between the adjacent composite truss segments 10. It may be set in advance so that there is no positional deviation.
[0031]
A compressive force is automatically introduced into the concrete upper floor slab 2 (upper chord material 1) in the composite truss segment 10 due to a post-mortem load. A steel material may be arranged in the bridge axis direction, and prestress may be introduced into the upper floor slab 2 by the PC steel material.
[0032]
The structure of the suspension cable combined truss bridge 22 is a structural form in which a composite truss simple girder is stiffened with a suspension cable, and the height of a general composite truss bridge having only a truss girder not using the suspension cable 12 is L / 10. ~ L / 8 (where L is the distance between the suspension branches of the suspension cable 12), but the height of the suspension cable combined truss bridge 22 of the present invention can be set to about L / 20. The members such as the vertical members 3 and 5 and the diagonal member 7 can be short members. In the form of the suspension cable combined truss bridge 22, the dead load is mainly supported by the suspension cable 12, and the live load is mainly shared by the rigidity of the truss girder 23. Thus, the suspension cable 12 and the truss girder are configured to distribute the load.
[0033]
In addition, since the suspension cable 12 and the truss girder 23 are used in combination, the high rigidity of the truss allows the upper floor slab 2 to be a bridge through which the vehicle can pass, and the truss girder 23 is supported by the suspension cable 12. Therefore, the behavior of the suspension cable 12 engaged with the saddle 11 by the truss girder 23 can also be stabilized. Moreover, by leaving the end portion of the suspension cable 12 without cutting, the suspension cable combination truss bridge 22 can be easily disassembled by, for example, a reverse procedure from the construction procedure of the suspension cable combination truss bridge 22 described above. Can be removed.
[0034]
Further, since the suspension cable 12 is used as it is as a main cable for the bridge completion system, it is possible to reduce the amount of materials used compared to the case where the suspension cable 12 and the main cable for the bridge completion system are separated.
[0035]
In the suspension cable combined use truss bridge 23 of the above-described embodiment, the suspension cable 12 is fixed to the abutment 13, but as shown in FIG. 15, the end of the suspension cable 12 is fixed to the fixing portion 29 at the end of the truss girder 23. The suspension cable 12 on the side of the abutment 13 is released from the tension state, the abutment 13 as a reaction body of the suspension cable 12 is opened, is self-contained, and is mounted on the support device on the abutment 13 The combined suspension cable combined use truss bridge 22 may be used. In this case, the tension of the ground anchor 14 on the abutment 13 side may be released as necessary. In order to fix to the end portion of the truss girder 23 in this way, for example, as shown in FIG. 10, the vertical members 3 and 5 of the composite truss segment 10 located at the end portion on each abutment side are preliminarily or retrofitted. A steel fixing plate 24 is installed to form a fixing portion 29, and the suspension cable 12 is fixed to the truss girder 23 in front of each abutment 13 by, for example, a wedge-type fixing tool using a known suspension cable insertion sleeve and wedge. That's fine.
[0036]
Second Embodiment
FIG. 11 shows a second embodiment of the suspension cable combined truss bridge 22 constructed in the same manner as the construction method of the suspension cable combined truss bridge. In this embodiment, the vertical members 3, 5 and the diagonal members 7 positioned below the suspension cable 12 in the plurality of composite truss segments 10 positioned on the end side of the truss beam 23 are shortened, and the truss beam 23 is shortened. In this embodiment, the height dimension on the end side is reduced, and the other configurations and modifications are the same as those in the above-described embodiment.
[0037]
In this way, the steel material usage of the composite truss segment 10 on the end side of the truss girder 23 may be kept low so as to suit the landscape.
[0038]
<Third Embodiment>
FIG. 13 shows a third embodiment of the suspension cable combined truss bridge 22 constructed in the same manner as the construction method of the suspension cable combined truss bridge. In this configuration, the height of the truss portion can be made smaller than the sag of the suspension cable 12, and the lower vertical members 25 and 26 for eccentricity of the suspension cable are attached from the lower chord material rating part to suspend the composite truss segment 10. This is a form supported by the cable 12. More specifically, in this embodiment, a plurality of composite truss segments 10 positioned in the middle part of the truss girder 23 are used as shown in FIG. In this composite truss segment 10, the upper portions of the lower vertical members 25, 26 made of four steel pipe members are welded to the lower extension of the lower chord members 4, 6 on the lower extension of each vertical member 3, 5 or The saddle support members 8 and 9 are fixed by welding or bolts in advance to a predetermined level of the lower vertical members 25 and 26 facing each other, and the saddle support members 8 and 9 have six saddles in the same manner as described above. 11 is provided.
[0039]
In this way, the vertical height member for eccentricity for making the suspension cable 12 eccentric from the truss girder 23 by the lower vertical members 25 and 26 with the construction height of the truss girder 23 constant. Since other configurations and modifications are the same as those of the above-described embodiment, the same parts are denoted by the same reference numerals and the description thereof is omitted.
[0040]
<Fourth embodiment>
FIG. 14 shows a fourth embodiment of the suspension cable combined truss bridge 22 constructed in the same manner as the construction method of the suspension cable combined truss bridge. In this embodiment, the composite truss segment 10 as shown in FIG. 7 is used over the entire length of the truss girder 23. However, the lengths of the vertical members 3 and 5 and the diagonal member 7 are changed symmetrically over the entire length of the truss girder 23, and the lower chord members 4 and 6 are changed from a straight lower chord member to a circle if necessary. An arc-shaped lower chord is used. In addition, the height of the truss girder 23 is changed in a curved shape over the entire length of the truss girder 23. Since other configurations and modifications are the same as those of the above-described embodiment, the same parts are denoted by the same reference numerals and the description thereof is omitted.
[0041]
As in this embodiment, the construction height may be increased at the center of the truss girder 23 and changed over the entire length of the truss girder 23. As in the first to fourth embodiments, the truss girder 23 may be lowered or raised as appropriate. Generally, when the truss girder 23 is raised. When the structural characteristics of the truss become dominant and the height of the truss girder 23 is lowered to make the suspension cable 12 highly eccentric, the structural characteristics as the suspension structure become dominant. The height of the truss girder 23 may be determined from the viewpoint of the scenery with the surrounding natural scenery, the bending of the suspension cable combined use truss bridge 23, vibration, fatigue, and the like.
[0042]
As in the first to fourth embodiments, the unitized composite truss segment 10 is used, and the upper floor slab 2 is successively continued to build the bridge surface, and the suspension cable combined truss bridge 22 is built. Since the work on the bridge surface can be reduced, it is possible to reduce the use of construction materials such as a scaffold for construction as in the past.
[0043]
In the composite truss segment 10, the lower chord members 4 and 6 are tensile members, so there is no possibility of buckling. However, depending on the loading conditions, the lower chord members 4 and 6 may be in a compressed state. Depending on the case, in order to increase the torsional rigidity of the composite truss segment 10 and to prevent the buckling of the lower chord members 4 and 6, a lateral connecting member may be attached to the grading portion of the lower chord members 4 and 6 to prevent buckling. .
[0044]
When the composite truss segment 10 is installed on the suspension cable 12, in the above embodiment, the composite truss segment 10 is pulled from one abutment 13 toward the other abutment 13. Alternatively, the suspension cable 12 may be pulled and conveyed from the abutment 13 to the central portion of the suspension cable 12 and installed from the central portion of the suspension cable 12 toward each abutment 13. In addition, as shown in FIG. 16, the composite truss segments 10 are sequentially installed on the suspension cables 12 from both opposed abutments 13 toward the center of the suspension cables 12, and the vertical members in the adjacent composite truss segments 10 are arranged. 3 (5) The mutual truss segments 10 may be suspended and conveyed by the cranes 27 that are coupled to each other with high tension bolts and run on the composite truss segments 10, and may be installed on the suspension cable 12. If the composite truss segment 10 is installed on the suspension cable 12 from the both abutments 13 in this way, a suspension cable combined truss bridge can be constructed in a shorter construction period, and the construction cost can be reduced.
[0045]
When the characteristics of the suspension cable combined truss bridge and its construction method are enumerated using the composite truss segment of the embodiment, the following can be said.
(1) The composite truss girder 23 is composed of a concrete upper floor slab 2 that also serves as the upper chord material 1, a lower chord material 4, 6 of the steel member or concrete member, a diagonal member 7, and a belly material A of the vertical members 3, 5. It is composed of a combination of multiple composite truss segments 10.
(2) A grout operation can be omitted by using a prefabricated cable for the hanging cable 12.
(3) The truss girder 23 can be installed by placing the composite truss segment 10 divided in the bridge axis direction on the suspension cable 12 and sending it out.
{Circle around (4)} The composite truss segment 10 can be easily assembled at the site by building the precast concrete upper floor slab 2, the lower chord members 4, 6 and the abdomen A, which are manufactured in advance at the factory or site.
(5) The joint of the composite truss segment 10 (particularly the concrete member) has a match cast structure, and the lower chord members 4 and 6 are pre-stressed with PC steel in order to reduce the tension due to a post-dead load or a live load. It is good to introduce stress.
{Circle around (6)} A compressive force is automatically introduced into the concrete upper floor slab 2 (upper chord material 1) by a post-mortem load. However, in some cases, prestress may be introduced by a PC steel material.
(7) The vertical members 3 and 5 on the joint surface of the composite truss segment have a structure in which shear force is transmitted by HT bolts (high tension bolts).
(8) The height of the steel truss bridge 22 between the single diameters is generally L / 10 to L / 8, but the structure type of the present invention can be set to about L / 20, which is excellent in landscape. .
(9) When the bridge (the suspension cable combined truss bridge 22) becomes unnecessary, the suspension cable combined truss bridge 22 can be easily removed using the suspension cable 12.
[0046]
In each of the above embodiments, when dismantling and removing the temporary or main suspension cable combined truss bridge 22 from the state where the suspension cable 12 is fixed in a tensioned state on the abutment 13 side, the end side is sequentially changed. After removing the high-tensile bolt 21 joining the vertical members 3 and the vertical members 5 in the composite truss segment 10 and the composite truss segment 10 connected thereto, the composite truss segment 10 on the end side is removed by a crane or the like. Then, the high-tension bolts 21 joining the composite truss segments 10 to each other are sequentially removed, and the separated composite truss segment 10 is moved to the abutment 13 side via a rope or the like with a winch or the like. The composite truss segment 10 is removed from the suspension cable 12 with a crane or the like. After removing the composite truss segment 10, a plurality of winches 17, 18 are installed on each abutment 13, and each support wire 19 is stretched over these drums, and each of the casing pipes 16 on one abutment 13 is pulled out. The end portion of the suspension cable 12 can be locked and held by the support wire 19, the winch 17 (18) can be driven, conveyed to the other abutment 13 side, and removed. Thus, the suspension cable combined use truss bridge 22 can be easily disassembled and removed by a procedure reverse to the construction method of the suspension cable combined use truss bridge 22.
[0047]
According to the above embodiment, a structural form in which a truss girder such as a composite truss simple girder is stiffened with a suspension cable as a bridge between single diameters in a mountainous area or the like using a unitized compound truss segment The truss bridge with suspension cable can be easily constructed and constructed in a short construction period.
[0048]
As shown in the above embodiments, in the case of the present invention, when the truss bridge 22 with suspension cable is used with the anchor mounted on the abutment 13 as a reaction body of the suspension cable 12 (another suspension type suspension). A cable-use truss bridge) and a self-supporting type that releases the reaction force acting on the abutment 13 (the ground anchor 14 if necessary) and fixes it to the bridge body (truss girder 23). Either method is possible, and it is possible to change between the two methods from other methods to self-contained (or from self-contained to other methods). Or, it may be appropriately selected according to the use conditions. Further, the self-contained type is advantageous as a truss bridge combined with a suspension cable, and the other type is advantageous as a truss bridge combined with a temporary suspension cable because it can be easily removed later. In addition, in the case of either the other type or the self type, depending on the use conditions, it may be a permanent or temporary suspension cable combined truss bridge.
[0049]
【The invention's effect】
The present invention has the following effects.
1. Suspension bridges that do not use trusses, such as conventional ones, have large vibrations and drooping problems. However, by using a truss girder together with the suspension cables, the high rigidity of the truss girder suppresses vibrations and sags of the suspension bridge. In addition, the suspension cable combined truss bridge that can be used as a road without the above-mentioned problem even when the vehicle passes on the upper floor slab can be obtained.
2. By using the suspension cable and the truss girder together, the height of the truss girder can be reduced, the construction cost of the suspension cable combined truss bridge can be reduced, and the cost is reduced.
3. Instead of using a flat concrete lower floor slab, instead of using a straight lower chord material, the weight of the truss bridge with suspension cable is reduced.
4). The composite truss segment is a simple structure with the upper floor slab, diagonal and vertical materials, and lower chord material as a unit, and installing this will shorten the construction period and reduce costs.
6). The suspension cable combined truss bridge can be easily removed, for example, by a procedure reverse to the construction procedure, which is advantageous as a temporary road.
7). The suspension cable is fixed to the truss girder in the vicinity of the end, and the tension of the suspension cable on the abutment side is released, so that it can be used as a main bridge. (The suspension cable is fixed to the abutment and the abutment is balanced by anchoring with a ground anchor, etc. However, if anchored for a long time, the anchoring force will gradually weaken. Abutment (cut off the abute and fix it on the bridge. This is called self-restraint.)
8). In the case of the present invention, when using a truss bridge combined with a suspension cable with an anchor attached to the abutment as a reaction body of the suspension cable (when using a truss bridge combined with other suspension type suspension cables) It is possible to use either of the two methods of releasing the reaction force acting on the ground anchor (if necessary) and fixing it to the bridge body (truss girder). It is also possible to change between the two methods (or from the self-contained type to the other type), and the self-contained type or the other type can be selected as appropriate according to the use conditions. Further, the self-contained type is advantageous as a truss bridge combined with a suspension cable, and the other type is advantageous as a truss bridge combined with a temporary suspension cable because it can be easily removed later. In addition, in the case of either the other type or the self-contained type, it can be a truss bridge combined with a permanent or temporary suspension cable depending on the use conditions and the like.
[Brief description of the drawings]
FIG. 1 (a) is a schematic diagram showing a state in which an abutment opposed to a ground is anchored to the ground by a ground anchor, and a casing tube for inserting an end portion of a suspension cable is embedded and fixed to each abutment. A side view and (b) are figures which expand and show a part of (a).
[Fig. 2] A winch is provided on each abutment from the state of Fig. 1 (a), a support line is arranged over each winch, a suspension cable is extended from one winch toward the other winch, and a suspension cable is provided between the abutments. It is a schematic side view which shows the state which erected.
FIG. 3 is a schematic side view showing a state in which the composite truss segments placed on the suspension cable are sequentially sent from one abutment toward the other abutment after the suspension cable is installed, and the fed composite truss segments are joined together. It is.
FIG. 4 is a schematic side view showing a state in which a new composite truss segment is constructed using an end portion of an existing composite truss segment as a formwork at a site.
5A and 5B show a first embodiment of the composite truss segment of the present invention, in which FIG. 5A is a front view and FIG. 5B is a side view.
6A and 6B show a second embodiment of the composite truss segment of the present invention, where FIG. 6A is a front view and FIG. 6B is a side view.
7A and 7B show a third embodiment of the composite truss segment of the present invention, in which FIG. 7A is a front view, and FIG. 7B is a side view.
FIG. 8 is a side view showing a joint portion between composite truss segments adjacent to each other in the bridge axis direction.
FIG. 9 is a schematic side view showing the suspension cable combined truss bridge according to the first embodiment of the present invention.
FIG. 10 is a side view showing the vicinity of the composite truss segment at the end when the suspension cable is fixed to the end of the composite truss girder.
FIG. 11 is a schematic side view showing a suspension cable combined truss bridge according to a second embodiment of the present invention.
FIGS. 12A and 12B show a fourth embodiment of the composite truss segment of the present invention, wherein FIG. 12A is a front view and FIG. 12B is a side view.
FIG. 13 is a schematic side view showing a suspension cable combined truss bridge according to a second embodiment of the present invention.
14A is a schematic side view showing a suspension cable combined truss bridge according to a third embodiment of the present invention, and FIG. 14B is an enlarged view of a part thereof.
FIG. 15 is a schematic side view showing a configuration in which a suspension cable is fixed to a composite truss girder and tension of the suspension cable on the abutment side is released to form a self-supporting suspension cable combined truss bridge.
FIG. 16 is a schematic side view showing a state in which the composite truss segment is installed from each abutment toward the central portion of the suspension cable.
[Explanation of symbols]
1 Upper chord material
2 Upper floor version
3 Vertical material
4 Lower chord material
5 Vertical material
6 Lower chord material
7 diagonal materials
8 Saddle support member
9 Saddle support member
10 Composite truss segment
11 saddle
12 Hanging cable
13 Abutment
14 Ground anchor
15 ground
16 Mantle tube
17 winches
18 winches
19 Support line
20 Bolt insertion hole
21 High tension bolt
22 Truss bridge with suspension cable
23 truss girder
24 Fixing plate
25 Lower vertical material
26 Lower vertical material
27 crane
29 Fixing part
30 scaffolding
31 Reinforcing material

Claims (9)

  1. A composite truss segment used in a truss bridge combined with a suspension cable, wherein the composite truss segment includes an upper floor slab also serving as an upper chord material, and an abdominal material of a truss structure provided with a vertical member for joining in the bridge axis direction. A composite truss segment characterized in that it is unitized by a lower chord material provided integrally therewith and has a saddle for a suspension cable.
  2. The abdomen is composed of a vertical member arranged at an interval in the bridge axis direction and a diagonal member arranged between these vertical members, and the vertical member is a composite adjacent to the bridge axis direction. The composite truss segment according to claim 1, wherein bolt holes for joining the truss segments to each other are provided at intervals in the vertical direction of the vertical member.
  3. The upper part of the vertical material is fixed to both ends of the lower part of the concrete upper floor slab that also serves as the upper chord material and spaced at both ends in the direction perpendicular to the bridge axis. The lower chord material is arranged and fixed over the vertical material, and the lower chord material is arranged and fixed over the lower part of each vertical material on the other side in the direction perpendicular to the bridge axis, and the bridge shaft in the concrete upper deck A slant is placed and fixed on both sides in the right-angle direction and a part surrounded by the vertical material and the lower chord material, and a saddle support member is installed and fixed on the vertical material facing the direction perpendicular to the bridge axis. The composite truss segment according to claim 1 or 2, wherein a saddle for a suspension cable mounted on the suspension cable is fixed to a lower portion of the support member.
  4. The composite truss segment according to any one of claims 1 to 3 is used, and a saddle for suspension cables in the multiple composite truss segments is attached to a suspension cable stretched between abutments. The vertical members of the composite truss segments that are placed on the suspension cable and adjacent to each other in the bridge axis direction are joined together to form a composite truss girder, and the composite truss girder is supported by the suspension cable. Suspension cable combined truss bridge, which distributes the load by
  5. 5. The suspension cable combined use truss bridge according to claim 4, wherein the suspension cable is fixed at both ends of the composite truss girder, and the tension of the suspension cable on the abutment side is released to be self-supporting. A truss bridge combined with a suspension cable.
  6. After a plurality of suspension cables are stretched across the abutment, the composite truss segments according to any one of claims 1 to 3 are sequentially placed on the cable, and the composite truss segments are sequentially sent out. The end vertical members of each composite truss segment adjacent to each other in the bridge axis direction are joined together by high-tensile bolts to construct a composite truss girder, and the end of the composite truss girder is placed on the abutment and supported by the suspension cable A construction method of a truss bridge with a suspension cable, characterized in that a composite truss girder is constructed.
  7. After constructing the suspension cable combined truss bridge according to claim 6, the suspension cable is fixed to both ends of the composite truss girder, and the tension of the suspension cable end engaged with the abutment is released to act on the abutment. A method for constructing a truss bridge combined with a suspension cable, wherein the reaction force of the suspension cable is released.
  8. In the construction method of the suspension cable combined use truss bridge according to claim 6, after leaving the suspension cable of the abutment portion without being cut and using the suspension cable combined use truss bridge, the procedure is reverse to the construction method of the suspension cable combined use truss bridge. The construction method of a truss bridge with suspension cable, characterized in that the truss bridge with suspension cable can be disassembled and removed.
  9. 8. The method of constructing a truss bridge combined with a suspension cable according to claim 7, wherein the suspension cable of the abutment portion is left without being cut, and after the truss bridge combined with the suspension cable is used, the suspension cable of the abutment portion is tensioned and fixed to the abutment. A construction method for a truss bridge combined with a suspension cable, wherein the suspension truss bridge combined with a suspension cable can be disassembled and removed by a procedure reverse to the construction method of the truss bridge combined with a suspension cable.
JP2002181464A 2002-06-21 2002-06-21 Composite truss segment and truss bridge with suspension cable using the same and its construction method Expired - Fee Related JP3881598B2 (en)

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