JP2009068248A - Girder-to-girder connection device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a girder-to-girder connection device which is mounted on a joint portion between bridge girders at bearing locations of a viaduct etc., enhances the continuity between the girders, reduces vibration and noise, and alleviates damage occurring at the girders at the time of an earthquake. <P>SOLUTION: The girder-to-girder connection device is formed of displacement limiting pieces 30, a joint plate 20, and sliding devices 40. Each displacement limiting piece 30 is mounted on a girder edge of the bridge girder 1A adjacently supported on a bearing of a pier, and consists of a mounting flange 30a which is mounted on the other bridge girder extended to the girder edge of the other bridge girder 1B, and a base flange 30b arranged so as to form a substantial ell together with the mounting flange 30a. The joint plate 20 is secured to the girder edge of the bridge girder 1B, and functions to inhibit fluctuation in the vertical direction of the displacement limiting pieces 30. Each sliding device 40 is interposed between the joint plate 20 and the displacement limiting piece 30, and allows relative displacement between the joint plate 20 and the displacement limiting piece 30 in a bridge axial direction. By virtue of restriction of the displacement limiting pieces 30, the bridge girders are inhibited from being relatively displaced in the vertical direction. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an inter-girder connecting device, and is used when connecting to an adjacent bridge girder or an abutment attached to an end of a bridge girder of a bridge so as to reduce traffic vibration caused by a vehicle passing between the girder. The present invention relates to an interdigit connecting device.

  In a viaduct such as an expressway, traffic vibration caused by vehicle traffic may be a problem. In many of conventional viaducts, simple composite girders have been planned and installed in consideration of economic efficiency. Recently, multi-span continuous bridges have been increasingly adopted for the purpose of improving vehicle runnability and maintenance by reducing the number of bridge expansion and contraction devices, and improving earthquake resistance. However, there is a limit to the bridge length that can be continued due to the expansion and contraction of the bridge girder caused by temperature change, and it is necessary to set a gap (gap) between adjacent bridge girders for each predetermined length.

  It is generally known that traffic vibration is caused by the presence of play between bridge girders. The buried joint is a pavement connection structure that can smooth the joints of the pavement surface. By constructing this buried joint, it is possible to reduce noise and vibration due to an impact generated when the vehicle passes through the joint of the paved surface. However, traffic vibrations caused by vehicle load jumping across the gap between bridge girders cannot be prevented by the construction of the buried joint.

Patent Document 1 proposes an apparatus that connects bridge girders and has seismic isolation performance for the purpose of preventing dropped bridges during a large earthquake. In the seismic isolated bridge prevention device including the connection plate described in Patent Document 1, the shear rigidity of laminated rubber is set for large deformation during an earthquake.
Patent Document 2 proposes a bridge support capable of preventing excessive subduction during passage of a large vehicle and suppressing generation of noise and vibration.

In order to cope with minute amplitudes such as traffic vibration, it is effective to install a connecting device that does not rattle in the vertical direction. The applicant has already proposed a vibration suppression viaduct (Patent Document 3) in which a connecting member is connected with a girder via a viscoelastic material such as asphalt.
See JP-A-9-184111. See JP-A-2006-77395. See JP 2000-73311 A.

  By the way, the apparatuses disclosed in Patent Documents 1 and 3 basically have a structure in which laminated rubber or asphalt is interposed between the base member on the steel beam side and the side surface of the connecting steel plate. In order to reduce traffic vibration, it is effective to connect the gaps with a member having as high rigidity as possible. However, the structure with laminated rubber or asphalt as in Patent Documents 1 and 3 provides sufficient rigidity. Cannot be secured. For this reason, it is not expected to be effective for countermeasures against vibrations of minute deformations such as traffic vibrations that occur when a vehicle passes. In addition, the bridge girder expands and contracts in the direction of the bridge axis as the temperature changes. However, as the bridge length increases, the extension amount of the end of the girder increases, and it is necessary to have a structure that can absorb this expansion and contraction amount. Further, when the bearing disclosed in Patent Document 2 described above is used, traffic vibration caused by sinking of the bearing can be reduced, but traffic vibration caused by bending or the like occurring in the bridge girder cannot be prevented. In addition, there is a problem that it is too costly to replace a bearing as a traffic vibration countermeasure for an existing bridge.

  Accordingly, an object of the present invention is to solve the above-described problems of the prior art, restrain the vertical displacement generated at the end of the bridge girder by the transfer of the vehicle, and smoothly transmit stress to the adjacent bridge girder. It is also possible to absorb the expansion and contraction amount of the bridge girder due to temperature change, and to provide an inexpensive girder connection device that can be installed not only on a newly built bridge but also on an existing bridge as a traffic vibration countermeasure .

  To achieve the above object, the present invention provides a connecting member attached to one girder end of a bridge girder supported adjacently on a support and extending to the girder end of the other bridge girder, A displacement limiting member that is fixed to a girder end portion of the bridge girder and suppresses fluctuation in the vertical direction of the connecting member, and is interposed between the connecting member and the displacement limiting member, and the connecting member and the displacement limiting member And a slide portion that allows relative displacement in the bridge axis direction, and restrains relative displacement in the vertical direction between the bridge girders by restraint of the displacement limiting member.

  The displacement limiting member includes a mounting flange portion attached to the other bridge girder, and a base flange portion formed in a substantially L shape with the flange portion, and the base flange portion has linkage with the connecting member. It is preferable to make it.

The displacement limiting member is formed with tapered surfaces at upper and lower end surfaces, and an inner peripheral surface of an opening formed in the connecting member is formed as a tapered surface that can be fitted to the tapered surface. It is preferable to suppress vertical displacement between the displacement limiting member and the connecting member.
It is preferable that the slide portion is a linear slider that is guided by a rail along the bridge axis direction and moves linearly.

  It is preferable that the opposing base flange portions are connected by a connecting rod member, and a predetermined axial force is applied to the connecting rod member to hold the connecting member.

  According to the present invention, the vertical displacement generated at the end of the bridge girder due to the transfer of the vehicle can be restrained, and stress can be transmitted smoothly to the adjacent bridge girder. As an anti-vibration measure that can be absorbed, it can be installed not only on new bridges, but also on existing bridges, and it is possible to provide an inexpensive inter-girder connection device.

  Hereinafter, the best mode for carrying out the inter-girder coupling device of the present invention will be described with reference to the accompanying drawings.

  FIG. 1 is an overall structural diagram in which an inter-girder connecting device 10 according to the present invention is installed across a gap 4 between adjacent bridge girders 1. As shown in FIG. 1, bridge girders 1A and 1B (hereinafter simply referred to as bridge girders 1. When distinguishing bridge girders, symbols A and B are attached) are installed on the upper surface of the pier beam section 3. Supported by the support 5. The bridge girder 1 is a prestressed concrete bridge (hereinafter referred to as a PC bridge), and a road surface pavement 6 is provided on the upper surface to ensure the traveling performance of the vehicle 7. An embedded joint 8 is installed in the gap 4 of the road pavement 6 to reduce noise and vibration due to impact when passing through the vehicle 7. The inter-girder connecting device 10 according to the present invention is attached in the vicinity of the end portion of the bridge girder 1 across the gap 4 of the bridge girder 1.

  FIG. 2 is a perspective view of the first inter-girder connecting device 10 according to the present invention. The connecting plate 20 installed across the adjacent bridge girders 1 is made of a rectangular steel plate. A plurality of connecting plate mounting bolt holes (not shown) are formed in the connecting plate 20 located on the bridge beam 1A side, and one opening 22 in which a rectangle is cut out is formed on the bridge beam 1B side. .

  On the bridge beam 1A side, a rectangular spacer plate 23 having a predetermined thickness is interposed between the beam connection device 10. As the spacer plate 23, in this embodiment, a mortar thin plate is used in which non-shrink mortar is applied in-situ with a mold (not shown). The spacer plate 23 eliminates unevenness with the connecting plate 20, disperses the stress acting on the bridge beam 1A, and plays a role of separating the connecting plate 20 and the bridge beam 1B by a predetermined distance. In the bridge beam 1 </ b> A, connecting plate mounting bolts 21 in which a predetermined number are arranged vertically and horizontally are planted through spacer plates 23. With this connecting plate mounting bolt 21, the connecting plate 20 can be fixed to the bridge beam 1 </ b> A through a connecting plate mounting bolt hole formed in the connecting plate 20.

  On the other hand, two displacement limiting pieces 30 as displacement limiting members that restrain the relative displacement in the vertical direction of the bridge beams 1A and 1B are attached to the position in the opening 22 on the bridge beam 1B. The opening 22 has a sufficient notch size in the bridge axis direction so as not to prevent expansion and contraction of the bridge girder 1 due to temperature change, and two displacement limiting pieces 30 are disposed therein. In this embodiment, the displacement limiting piece 30 is made of a steel material having an L-shaped cross section, and the mounting flange 30a is placed at a predetermined position on the bridge beam 1B via the spacer plate 23 by a plurality of displacement limiting piece mounting bolts 31. It is attached. At this time, the base flange 30 b that is perpendicular to the mounting flange 30 a is disposed along the upper and lower inner peripheral surfaces of the opening 22. The spacer plate 23 on the bridge girder 1B side may be constructed for each displacement limiting piece 30 or may have a size that can support the two displacement limiting pieces 30 simultaneously.

  FIG. 3 is a cross-sectional view of the inter-girder connection device 10 indicated by a cross-sectional line III-III in FIG. A guide rail 41 and a movable block 42 slidably engaged with the guide rail 41 are interposed between the connecting plate 20 and the base flange 30b. The guide rail 41 is fixed to the side surface of the base flange 30b with guide rail mounting bolts 43. The movable block 42 is fixed to the opening inner peripheral surface 22a of the connecting plate 20 by a movable block mounting bolt 44 (hereinafter, the guide rail 41 and the movable block 42 are collectively referred to as a slide device 40). The slide device 40 is composed of a linear guide member in which the movable block 42 is slid linearly in the axial direction of the guide rail 41, so that the slide device 40 can move the guide rail 41 and the movable block against expansion and contraction of the bridge girder due to temperature change. 42 can be slid. On the other hand, the cross-section of the guide rail 41 has a cross-sectional shape so that the movable block 42 does not separate from the guide rail 41, thereby suppressing the relative displacement of the vertical bridge girders 1A and 1B generated by traffic vibration. Can do.

  Various slide devices 40 are conceivable. For example, various known linear type slide devices can be applied. In this case, in order to reduce traffic vibration that is minute vibration, the clearance in the vertical direction of the slide device 40 is at least 0.5 mm or less, preferably 0.1 mm or less. Therefore, the final height adjustment of the displacement limiting piece 30 is preferably performed using the clearance between the displacement limiting piece mounting bolt hole 32 and the displacement limiting piece mounting bolt 31.

  Next, the dimension of each member of the inter-girder coupling device 10 will be described. The range of temperature change of the bridge girder varies depending on the environmental conditions at the bridge point, and the temperature expansion / contraction amount and traffic vibration amount of the bridge girder also vary depending on the bridge type and scale, the material of each member, and the like. Therefore, it is necessary to determine the dimensions of each member constituting the inter-girder coupling device 10 in consideration of these conditions. For example, the size of the opening 22 formed in the connecting plate 20 and the design slide amount of the slide device 40 can follow the design of the expansion device for the bridge. That is, the reference temperature is set from the environmental conditions of the bridge point, and the dimensions of the opening 22 and the slide device 40 according to the expansion / contraction amount of the bridge girder 1 are determined from the range of temperature change determined around the reference temperature. Can do.

  The amount of traffic vibration that occurs can also be determined when the cross section of the bridge girder 1 is determined. By calculating the stress necessary to reduce the amount of vibration, it is possible to determine the size and thickness of each member constituting the inter-girder coupling device 10, the number of bolts, the type of the slide device 40, and the like. For example, in a standard PC bridge in the present embodiment, it is assumed that the connecting plate 20 has a thickness of 50 mm or more, a width of 500 to 1000 mm, and a length of about 500 mm to 3000 mm.

  FIG. 4 shows an analysis result of the effect of the inter-girder coupling device 10 according to the present embodiment. As shown in the figure, the frequency of the vibration reduction target of this embodiment is about 1 Hz to 40 Hz for ground vibration countermeasures, and about 30 Hz to 200 Hz for solid sound countermeasures. In this analysis, adjacent simple girders with a bridge length of 30 m, which were built on a pier with a height of 15 m, were connected by a bridge girder connecting device with a predetermined rigidity, and traffic vibrations that occurred when passing a traffic vehicle were obtained. The vertical axis represents the acceleration execution value after bodily sensation correction, and the horizontal axis represents the vibration frequency. The acceleration execution value at a typical vibration frequency is plotted. In addition, □ indicates an example in which adjacent simple girders are connected by the bridge girder connecting device according to the present embodiment, and ● indicates an example without vibration countermeasures. From FIG. 4, the obtained acceleration execution value is approximately halved in the region where the frequency is 40 Hz or less as a countermeasure against the ground vibration, and the acceleration execution value is greatly increased even in the frequency of 40 Hz or more which is the region for the solid sound countermeasure. It can be seen that there is a reduction.

  As described above, by using the inter-girder coupling device 10 according to the present invention, it is possible to reduce traffic vibrations generated in the bridge girder 1 due to passage of a traffic vehicle and to reduce the generation of solid sound. Further, since the inter-girder connecting device 10 can be manufactured from a general-purpose material that has a simple configuration and is easily available, there is no manufacturing / construction cost. This is particularly effective when traffic vibration countermeasures are taken for existing bridge girders.

  In the above description, the flat plate-like connecting plate 20 has been described. However, when the plate thickness of the connecting plate 20 becomes larger than necessary due to a bending moment acting on the connecting plate 20, a reinforcing flange is welded to the connecting plate 20. The bending stiffness can be improved.

  FIG. 5 is a perspective view of the connecting plate 20 in which reinforcing flanges 24 are installed in the vicinity of the upper and lower sides. Since the connecting plate 20 that has been reinforced in this way and has increased bending stiffness can reduce the amount of deflection generated in the connecting plate 20 itself, the effect of reducing traffic vibration can be enhanced.

  In the present embodiment, the connecting plate mounting bolt 21 and the displacement limiting piece mounting bolt 31 can be installed near the center of the girder height. In general, in a bridge having a reinforced concrete structure such as a PC bridge, since there are few reinforcing bars near the center of the girder height, it is possible to easily construct the bolts without interfering with the reinforcing bars.

  In the above description, the application in a new PC bridge has been described. However, the present invention can also be applied to an existing PC bridge in which traffic vibration is a problem. In the case of existing bridges, traffic vibration can be measured directly. Therefore, the measured traffic vibration can be reflected in the design of the inter-girder connection device 10, and a rational design becomes possible. Further, when drilling anchors in the bridge girder 1 for fixing the inter-girder connecting device 10, it is necessary to search for the reinforcing bar of the bridge girder 1 and confirm a position where the hole can be drilled. Therefore, it is desirable that the bolt hole drilling of the connecting plate 20 and the displacement limiting piece 30 should be a hole position reflecting the reinforcing bar search result.

  Moreover, the inter-girder connection device 10 according to the present embodiment can also be adopted for a steel bridge. In this case, the spacer plate 23 is changed to a guide base member made of a thick steel plate to disperse the stress acting on the web, and an appropriate reinforcing material is installed as necessary to prepare for the buckling of the web. There is a need.

  In the following, a plurality of other embodiments will be described with a focus on components that are different from those in the first embodiment. However, it is needless to say that the portions essential to the configuration of the present invention also include the respective embodiments.

  FIG. 6 is a perspective view of the second inter-girder connection device 10 according to the present invention. In this embodiment, the upper and lower end surfaces of the connecting plate 20 are held by the displacement limiting piece 30 and the slide device 40. Therefore, it is not necessary to form an opening in the connecting plate 20, and the manufacturing cost of the member can be reduced. In the bridge girder coupling device 10 of the present embodiment, since the construction position of the displacement limiting piece mounting bolt 31 is farther from the center of the bridge girder 1B than in the first embodiment, it is advantageous to install in places where there are few restrictions on bolt construction. For example, the case where a displacement limiting piece is attached to the abutment side adjacent to the bridge girder can be considered.

  FIG. 7 is a perspective view of the third interdigit connecting device 10 according to the present invention. The connection plate 20 of the inter-girder connection device 10 according to the present embodiment has two openings 22 on the bridge beam 1B side. FIG. 8 is a cross-sectional view of the inter-girder connection device 10 indicated by a cross-sectional line VIII-VIII in FIG. The displacement limiting piece 30 is fixed to the bridge girder 1 </ b> B via the spacer plate 23 with a displacement limiting device mounting bolt 31 in the opening 22. The displacement limiting piece 30 has a groove shape, and a plurality of displacement limiting piece mounting bolt holes 32 are formed in the groove. The slide device 40 is installed in a gap between the displacement limiting piece 30 and the inner peripheral surface of the opening 22, and the slide device 40 can be installed without rattling by setting the opening 22 to a predetermined size.

  In the present embodiment, the number of installation of the slide device 40 can be increased compared to the first and second embodiments. Therefore, many resistance surfaces against traffic vibration can be arranged, and vibration of one bridge girder can be more reliably transmitted to the other bridge girder.

  FIG. 9 is a perspective view of the fourth interdigit connecting device 10 according to the present invention. Four openings 22 are formed in the connecting plate 20 of the inter-girder connecting device 10 according to the present embodiment. Even when compared with the inter-girder coupling device 10 shown in the third embodiment, the double (eight) slide devices 40 can be installed. Therefore, it is possible to reduce the stress acting on each slide device 40, and to more reliably transmit the vibration of one bridge girder to the other bridge girder.

  FIG. 10 is a perspective view of the fifth interdigit connecting device 10 according to the present invention. Two L-shaped displacement limiting pieces 30 are fixed to the bridge beam 1B via the spacer plate 23 with the base flanges 30b facing each other. A plurality of displacement limiting piece fastening steel rods 33 are inserted through the opposed base flanges 30b, and the displacement limiting pieces 30 are connected to each other. In this way, the connecting plate 20 is inserted into the space formed by the base flange 30b and the displacement limiting piece fastening steel rod 33. The connecting plate 20 that is inserted has its upper and lower end surfaces held by the base flange 30b, thereby reducing traffic vibrations.

  FIG. 11 is a partial cross-sectional view of the inter-beam connecting device 10 indicated by a cross-sectional line XI-XI in FIG. By applying the sliding material 35 to the contact surface between the base flange 30b and the upper and lower end faces of the connecting plate 20, it is possible to cope with the expansion and contraction in the bridge axis direction due to the temperature change of the bridge girder 1. Various materials can be considered as the sliding material 35, and general polytetrafluoroethylene (PTFE) or the like can be used as the sliding material.

  When the displacement limiting piece tightening steel rod 33 is tightened and a predetermined axial force is introduced, there is no gap between the base flange 30b and the connecting plate 20, and the effect of reducing traffic vibration can be enhanced. In order to eliminate the gap between the base flange 30b and the connecting plate 20 more reliably, the displacement limiting piece mounting bolt 31 is finally tightened after a predetermined axial force is applied to the displacement limiting piece tightening steel rod 33. preferable. Even if the slide device described in the first embodiment is installed instead of the sliding member 35, the effect of the present invention can be enjoyed.

  FIG. 12 is a perspective view of a sixth interdigit connecting device 10 according to the present invention. FIG. 13 is a partial cross-sectional view of the inter-girder connecting device 10 indicated by a cross-sectional line XIII-XIII in FIG. A displacement limiting piece 30 having a slit 36 is attached to the bridge beam 1 </ b> B via a spacer plate 23. The displacement limiting piece 30 includes a flat plate portion in contact with the spacer plate 23 and a U-shaped member fixed to the flat plate portion, and a slit 36 into which a connecting plate can be inserted is formed. The slit 36 desirably has a dimension that can sufficiently reduce the gap with the inserted connecting plate 20 in order to exert an effect of reducing traffic vibration. In addition, by providing the sliding member 35 on the contact surface between the connecting plate 20 and the slit 36, it is possible to cope with expansion and contraction in the bridge axis direction due to a temperature change of the bridge girder 1.

  FIG. 14 is a perspective view of a seventh interdigit connecting device 10 according to the present invention. FIG. 15 is a partial cross-sectional view of the inter-beam connecting device 10 indicated by a cross-sectional line XV-XV in FIG. Two openings 22 are formed in the connecting plate 20 located on the bridge beam 1B side. A tapered surface 25 is formed on the upper and lower inner peripheral surfaces of the opening 22 so that the opening widens toward the bridge beam 1B side. The opening 22 is fitted with a displacement limiting piece 30 inserted through a plurality of displacement limiting piece mounting bolts 31 protruding from the spacer plate 23. The displacement limiting piece 30 is made of a rectangular parallelepiped steel material, and a tapered surface 25 that can be fitted to the tapered surface of the connecting plate 20 is formed on the upper and lower end surfaces. Thereby, the inner peripheral surface of the opening 22 and the displacement limiting piece 30 can be brought into close contact with each other via the tapered fitting portion.

  The bearing plate 37 made of a steel plate is attached so as to be in contact with the connecting plate 20 with a displacement limiting piece mounting bolt 31 so as to cover the tapered fitting portion between the displacement limiting piece 30 and the connecting plate 20. A predetermined axial force is introduced into the displacement limiting piece mounting bolt 31 by a predetermined nut tightening force, and the axial force is a force for bringing the connecting plate 20 and the displacement limiting piece 30 into close contact with each other via the bearing plate 37. Acts as As a result, it is possible to eliminate the gap between the connecting plate 20 and the displacement limiting piece 30 and improve the effect of reducing traffic vibration.

  A thin Teflon (registered trademark) sliding material 35 is interposed between the contact surface of the connecting plate 20 and the displacement limiting piece 30 and the contact surface of the connecting plate 20 and the bearing plate 37. Thereby, the connection plate 20 and the displacement limiting piece 30 can be slid in the bridge axis direction in response to the expansion and contraction of the bridge girder 1 due to the temperature change.

  The taper surfaces of the connecting plate 20 and the displacement limiting piece 30 shown in the seventh embodiment can be set in the opposite direction. FIG. 16 is a partial cross-sectional view showing a modified example of the seventh inter-girder coupling device 10. As shown in the figure, the inner peripheral surface of the opening portion 22 of the connecting plate 20 is formed with a taper portion 25 whose opening becomes narrower toward the bridge beam 1 side. The displacement limiting piece 30 is formed. The pressure bearing plate 37 is disposed between the connecting plate 20 and the spacer plate 23. By introducing a predetermined axial force to the displacement limiting piece mounting bolt 31, the vertical gap between the connecting plate 20 and the displacement limiting piece 30 can be eliminated.

[Example of application to other structural formats]
FIG. 17 shows that a girder 1 (1A, 1B) is extended and extended from each pier 2 toward the center of the span by a cantilever method or the like, and a hinge support 5 is provided at each center of the span to form a continuous bridge. It is the schematic side view which showed the bridge structure format. In this case, the inter-girder coupling device 10 shown in each embodiment of the present invention is provided at the position of the hinge support 5 as shown in FIG. The girder connecting device 10 can be effectively applied to a bridge.

The whole structure figure which installed the connecting device between girders concerning the present invention across the gap between adjacent bridge girders. The perspective view which showed the 1st inter-beam connecting device which concerns on this invention. FIG. 3 is a cross-sectional view showing the inter-girder connecting device indicated by a cross-sectional line III-III in FIG. 2. The graph which showed the analysis result about the effect of the connecting device between digits concerning this example. The perspective view of the connection board which installed the reinforcement flange near upper and lower sides. The perspective view which showed the 2nd inter-beam connection apparatus which concerns on this invention. The perspective view which showed the 3rd inter-beam connection apparatus which concerns on this invention. FIG. 8 is a cross-sectional view showing the inter-girder connecting device indicated by a cross-sectional line VII-VII in FIG. 7. The perspective view which showed the 4th inter-beam connecting device which concerns on this invention. The perspective view which showed the 5th inter-beam connection apparatus which concerns on this invention. FIG. 11 is a partial cross-sectional view illustrating the inter-girder connecting device indicated by a cross-sectional line XI-XI in FIG. 10. The perspective view which showed the 6th inter-beam connecting device which concerns on this invention. FIG. 13 is a partial cross-sectional view illustrating the inter-girder connecting device indicated by a cross-sectional line XIII-XIII in FIG. 12. The perspective view which showed the 7th inter-beam connecting device which concerns on this invention. FIG. 15 is a partial cross-sectional view illustrating the inter-girder connecting device indicated by a cross-sectional line XV-XV in FIG. 14. The fragmentary sectional view which showed the modification of the 7th inter-beam connecting device which concerns on this invention. BRIEF DESCRIPTION OF THE DRAWINGS Schematic explanatory drawing which showed the example which applied the connecting device between girders which concerns on this invention to the bridge of the structure type which has a support in the center of span.

Explanation of symbols

1, 1A, 1B Bridge girder 4 Spacing 5 Bearing 10 Girder connecting device 20 Connecting plate 21 Connecting plate mounting bolt 22 Opening portion 23 Spacer plate 24 Reinforcement flange 25 Taper portion 30 Displacement limiting piece 33 Displacement limiting piece tightening steel rod 35 Sliding material 37 Supporting plate 40 Slide device 41 Guide rail 42 Movable block

Claims (5)

A connecting member attached to one girder end of a bridge girder supported adjacent to the bearing and extending to the girder end of the other bridge girder;
A displacement limiting member that is fixed to the end of the other bridge girder and suppresses fluctuation in the vertical direction of the connecting member;
A slide portion interposed between the connecting member and the displacement limiting member, and allowing a relative displacement in the bridge axis direction between the connecting member and the displacement limiting member;
An inter-girder coupling device that suppresses relative displacement in the vertical direction between bridge girders by restraint of the displacement limiting member. The displacement limiting member includes a mounting flange portion attached to the other bridge girder, and a base flange portion formed in a substantially L shape with the flange portion,
The inter-girder connection device according to claim 1, wherein the base flange portion has linkage of the connection member.   The displacement limiting member is formed with tapered surfaces at upper and lower end surfaces, and an inner peripheral surface of an opening formed in the connecting member is formed as a tapered surface that can be fitted to the tapered surface. The inter-girder coupling device according to claim 1, wherein vertical displacement between the displacement limiting member and the coupling member is suppressed.   4. The inter-girder connection device according to claim 1, wherein the slide portion is a linear slider that is guided by a rail along a bridge axis direction and linearly moves. 5.   The connecting base members are connected to each other by a connecting rod member, and a predetermined axial force is applied to the connecting rod member to hold the connecting member. The inter-beam connecting device according to any one of claims 4 to 5.

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